diff --git a/backend/package/yuxi/services/viewer_filesystem_service.py b/backend/package/yuxi/services/viewer_filesystem_service.py
index 2a6d466c..a935b185 100644
--- a/backend/package/yuxi/services/viewer_filesystem_service.py
+++ b/backend/package/yuxi/services/viewer_filesystem_service.py
@@ -507,3 +507,42 @@ async def download_viewer_file(
         "Content-Disposition": f"attachment; filename*=UTF-8''{quote(file_name)}",
     }
     return StreamingResponse(stream, media_type=media_type, headers=headers)
+
+
+async def delete_viewer_file(
+    *,
+    thread_id: str,
+    path: str,
+    agent_id: str | None,
+    agent_config_id: int | None,
+    current_user: User,
+    db: AsyncSession,
+) -> dict:
+    if not thread_id:
+        raise HTTPException(status_code=422, detail="thread_id 不能为空")
+
+    normalized_path = _normalize_path(path)
+    await _resolve_viewer_state(
+        thread_id=thread_id,
+        agent_id=agent_id,
+        agent_config_id=agent_config_id,
+        current_user=current_user,
+        db=db,
+    )
+
+    if not _is_user_data_path(normalized_path):
+        raise HTTPException(status_code=400, detail="当前路径不支持删除")
+
+    try:
+        actual_path = resolve_virtual_path(thread_id, normalized_path)
+        if not actual_path.exists():
+            raise HTTPException(status_code=404, detail="文件不存在")
+        if actual_path.is_dir():
+            raise HTTPException(status_code=400, detail="当前路径是目录")
+        await asyncio.to_thread(actual_path.unlink)
+    except PermissionError as e:
+        raise HTTPException(status_code=400, detail=str(e)) from e
+    except ValueError as e:
+        raise HTTPException(status_code=422, detail=str(e)) from e
+
+    return {"success": True, "path": normalized_path}
diff --git a/backend/server/routers/filesystem_router.py b/backend/server/routers/filesystem_router.py
index 72e28aee..f99458a9 100644
--- a/backend/server/routers/filesystem_router.py
+++ b/backend/server/routers/filesystem_router.py
@@ -11,6 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from server.utils.auth_middleware import get_db, get_required_user
 from yuxi.services.viewer_filesystem_service import (
+    delete_viewer_file,
     download_viewer_file,
     list_viewer_filesystem_tree,
     read_viewer_file_content,
@@ -58,6 +59,25 @@ async def get_viewer_file(
     )
 
 
+@filesystem_router.delete("/file", response_model=dict)
+async def delete_viewer_file_route(
+    thread_id: str = Query(..., description="线程 ID"),
+    path: str = Query(..., description="文件路径"),
+    agent_id: str | None = Query(None, description="智能体 ID"),
+    agent_config_id: int | None = Query(None, description="智能体配置 ID"),
+    current_user: User = Depends(get_required_user),
+    db: AsyncSession = Depends(get_db),
+):
+    return await delete_viewer_file(
+        thread_id=thread_id,
+        path=path,
+        agent_id=agent_id,
+        agent_config_id=agent_config_id,
+        current_user=current_user,
+        db=db,
+    )
+
+
 @filesystem_router.get("/download")
 async def download_viewer(
     thread_id: str = Query(..., description="线程 ID"),
diff --git a/backend/test/integration/api/test_viewer_filesystem_router.py b/backend/test/integration/api/test_viewer_filesystem_router.py
index 80775ef0..e3b79747 100644
--- a/backend/test/integration/api/test_viewer_filesystem_router.py
+++ b/backend/test/integration/api/test_viewer_filesystem_router.py
@@ -334,6 +334,34 @@ async def test_viewer_download_returns_full_file_for_large_user_data_content(tes
     assert response.content == large_content.encode("utf-8")
 
 
+async def test_viewer_delete_removes_user_data_file(test_client, standard_user):
+    headers = standard_user["headers"]
+    thread_id = await _create_thread_for_user(test_client, headers)
+
+    ensure_thread_dirs(thread_id)
+    actual_path = sandbox_workspace_dir(thread_id) / "delete_me.txt"
+    actual_path.write_text("delete me", encoding="utf-8")
+    file_path = virtual_path_for_thread_file(thread_id, actual_path)
+
+    delete_response = await test_client.delete(
+        "/api/viewer/filesystem/file",
+        params={"thread_id": thread_id, "path": file_path},
+        headers=headers,
+    )
+    assert delete_response.status_code == 200, delete_response.text
+    assert delete_response.json()["success"] is True
+    assert not actual_path.exists()
+
+    tree_response = await test_client.get(
+        "/api/viewer/filesystem/tree",
+        params={"thread_id": thread_id, "path": "/home/gem/user-data/workspace"},
+        headers=headers,
+    )
+    assert tree_response.status_code == 200, tree_response.text
+    paths = {entry.get("path") for entry in tree_response.json().get("entries", [])}
+    assert file_path not in paths
+
+
 async def test_viewer_tree_root_hides_kbs_namespace_when_no_database_is_visible(test_client, standard_user):
     headers = standard_user["headers"]
     thread_id = await _create_thread_for_user(test_client, headers)
diff --git a/docs/develop-guides/roadmap.md b/docs/develop-guides/roadmap.md
index 1403e334..e2443909 100644
--- a/docs/develop-guides/roadmap.md
+++ b/docs/develop-guides/roadmap.md
@@ -57,7 +57,8 @@
 
 ### 修复
 
-- 调整前端工作台文件预览交互：恢复默认侧边/弹窗预览，并新增显式“全屏预览”入口；全屏模式下由预览内容直接覆盖整页，仅保留右上角悬浮关闭按钮
+- 为前端工作台文件树补齐文件删除能力：`/api/viewer/filesystem/file` 新增删除接口，`AgentPanel` 文件节点新增删除按钮与确认交互，删除后会同步刷新树与预览状态
+- 调整前端工作台文件预览交互：恢复默认侧边/弹窗预览，并新增显式“全屏预览”入口；全屏模式下由预览内容直接覆盖整页，仅保留右上角悬浮关闭按钮；
 - 统一 Agent Panel 文件预览与消息区交付物预览组件：两处改为复用同一套 `AgentFilePreview` 预览实现，并为交付物预览补齐与工作台一致的“全屏预览”入口
 - 兼容旧版已安装的内置 `reporter` 技能记录：`update_builtin_skill` 现在会识别由 `system` 或 `builtin-system` 管理的历史记录，避免更新时误报“技能 `reporter` 不是内置 skill”
 - 调整沙盒 user-data 目录隔离策略：`workspace` 改为共享目录 `saves/threads/shared/workspace`，`uploads/outputs` 继续保持 thread 级隔离；同时更新 thread artifact 权限校验、viewer 文件系统列举逻辑，以及对应的 router/E2E 测试
diff --git a/web/src/apis/viewer_filesystem.js b/web/src/apis/viewer_filesystem.js
index 1f7ec21f..c99f58af 100644
--- a/web/src/apis/viewer_filesystem.js
+++ b/web/src/apis/viewer_filesystem.js
@@ -1,4 +1,4 @@
-import { apiGet } from './base'
+import { apiDelete, apiGet } from './base'
 
 const buildQuery = (params) => {
   const query = new URLSearchParams()
@@ -38,3 +38,8 @@ export const downloadViewerFile = (threadId, path, agentId = null, agentConfigId
   const query = buildViewerQuery(threadId, path, agentId, agentConfigId)
   return apiGet(`/api/viewer/filesystem/download?${query}`, {}, true, 'blob')
 }
+
+export const deleteViewerFile = (threadId, path, agentId = null, agentConfigId = null) => {
+  const query = buildViewerQuery(threadId, path, agentId, agentConfigId)
+  return apiDelete(`/api/viewer/filesystem/file?${query}`)
+}
diff --git a/web/src/components/AgentPanel.vue b/web/src/components/AgentPanel.vue
index 00d0ca0e..70aea378 100644
--- a/web/src/components/AgentPanel.vue
+++ b/web/src/components/AgentPanel.vue
@@ -98,6 +98,14 @@
                     >
                       <Download :size="14" />
                     </button>
+                    <button
+                      class="tree-action-btn tree-delete-btn"
+                      :disabled="deletingPaths.has(node.key)"
+                      @click.stop="confirmDeleteFile(node)"
+                      title="删除文件"
+                    >
+                      <Trash2 :size="14" />
+                    </button>
                   </div>
                 </template>
               </FileTreeComponent>
@@ -153,7 +161,15 @@
 
 <script setup>
 import { computed, onMounted, onUnmounted, onUpdated, nextTick, ref, watch } from 'vue'
-import { ChevronsDownUp, ChevronsUpDown, Download, FolderCode, RefreshCw, X } from 'lucide-vue-next'
+import {
+  ChevronsDownUp,
+  ChevronsUpDown,
+  Download,
+  FolderCode,
+  RefreshCw,
+  Trash2,
+  X
+} from 'lucide-vue-next'
 import {
   CheckCircleOutlined,
   SyncOutlined,
@@ -161,9 +177,11 @@ import {
   CloseCircleOutlined,
   QuestionCircleOutlined
 } from '@ant-design/icons-vue'
+import { Modal, message } from 'ant-design-vue'
 import FileTreeComponent from '@/components/FileTreeComponent.vue'
 import AgentFilePreview from '@/components/AgentFilePreview.vue'
 import {
+  deleteViewerFile,
   downloadViewerFile,
   getViewerFileContent,
   getViewerFileSystemTree
@@ -219,6 +237,7 @@ const panelWidth = ref(0)
 const dynamicTreeData = ref([])
 const selectedKeys = ref([])
 const expandedKeys = ref([])
+const deletingPaths = ref(new Set())
 
 const useInlinePreview = computed(() => panelWidth.value >= INLINE_PREVIEW_MIN_WIDTH)
 
@@ -342,6 +361,24 @@ const updateTreeChildren = (nodes, targetKey, children) => {
   })
 }
 
+const removeTreeNode = (nodes, targetKey) => {
+  return nodes.reduce((result, node) => {
+    if (node.key === targetKey) {
+      return result
+    }
+
+    const nextNode = node.children?.length
+      ? {
+          ...node,
+          children: removeTreeNode(node.children, targetKey)
+        }
+      : node
+
+    result.push(nextNode)
+    return result
+  }, [])
+}
+
 const parseDownloadFilename = (contentDisposition) => {
   if (!contentDisposition) return ''
 
@@ -500,6 +537,39 @@ const closePreview = () => {
   selectedKeys.value = []
 }
 
+const confirmDeleteFile = (node) => {
+  const fileName = node?.title || getFileName(node?.fileData)
+  Modal.confirm({
+    title: `确认删除文件「${fileName}」？`,
+    content: '删除后不可恢复。',
+    okText: '删除',
+    okType: 'danger',
+    cancelText: '取消',
+    onOk: async () => {
+      const nextDeletingPaths = new Set(deletingPaths.value)
+      nextDeletingPaths.add(node.key)
+      deletingPaths.value = nextDeletingPaths
+
+      try {
+        await deleteViewerFile(props.threadId, node.key, props.agentId, props.agentConfigId)
+        dynamicTreeData.value = removeTreeNode(dynamicTreeData.value, node.key)
+        selectedKeys.value = selectedKeys.value.filter((key) => key !== node.key)
+        if (currentFilePath.value === node.key) {
+          closePreview()
+        }
+        message.success('文件删除成功')
+      } catch (error) {
+        console.error('删除文件失败:', error)
+        message.error(error?.message || '删除文件失败')
+      } finally {
+        const latestDeletingPaths = new Set(deletingPaths.value)
+        latestDeletingPaths.delete(node.key)
+        deletingPaths.value = latestDeletingPaths
+      }
+    }
+  })
+}
+
 const downloadFile = async (fileItem) => {
   if (!props.threadId || !fileItem?.path) return
 
@@ -1118,6 +1188,11 @@ watch(useInlinePreview, (isInline) => {
   color: var(--gray-500);
   cursor: pointer;
   padding: 0;
+
+  &:disabled {
+    cursor: not-allowed;
+    opacity: 0.45;
+  }
 }
 
 .tree-download-btn:hover {