diff --git a/core/main_terminal.py b/core/main_terminal.py
index 2e9d46a..2e30875 100644
--- a/core/main_terminal.py
+++ b/core/main_terminal.py
@@ -1369,6 +1369,20 @@ class MainTerminal:
                     }
                 }
             },
+            {
+                "type": "function",
+                "function": {
+                    "name": "close_sub_agent",
+                    "description": "强制关闭指定子智能体，适用于长时间无响应、超时或卡死的任务。使用前请确认必要的日志/文件已保留，操作会立即终止该任务。",
+                    "parameters": {
+                        "type": "object",
+                        "properties": {
+                            "task_id": {"type": "string", "description": "子智能体任务ID"},
+                            "agent_id": {"type": "integer", "description": "子智能体编号（1~5），若缺少 task_id 可用"}
+                        }
+                    }
+                }
+            },
             {
                 "type": "function",
                 "function": {
@@ -1990,6 +2004,12 @@ class MainTerminal:
                     timeout_seconds=wait_timeout
                 )
                 self._record_sub_agent_message(result.get("system_message"), result.get("task_id"), inline=False)
+
+            elif tool_name == "close_sub_agent":
+                result = self.sub_agent_manager.terminate_sub_agent(
+                    task_id=arguments.get("task_id"),
+                    agent_id=arguments.get("agent_id")
+                )
             
             else:
                 result = {"success": False, "error": f"未知工具: {tool_name}"}
diff --git a/modules/sub_agent_manager.py b/modules/sub_agent_manager.py
index e805d5f..00a2083 100644
--- a/modules/sub_agent_manager.py
+++ b/modules/sub_agent_manager.py
@@ -206,6 +206,31 @@ class SubAgentManager:
         self._save_state()
         return finalize_result
 
+    def terminate_sub_agent(
+        self,
+        *,
+        task_id: Optional[str] = None,
+        agent_id: Optional[int] = None,
+    ) -> Dict:
+        """强制关闭指定子智能体。"""
+        task = self._select_task(task_id, agent_id)
+        if not task:
+            return {"success": False, "error": "未找到对应的子智能体任务"}
+
+        task_id = task["task_id"]
+        response = self._call_service("POST", f"/tasks/{task_id}/terminate", timeout=10)
+        if response.get("success"):
+            task["status"] = "terminated"
+            task["final_result"] = {
+                "success": False,
+                "status": "terminated",
+                "task_id": task_id,
+                "agent_id": task.get("agent_id"),
+                "message": response.get("message") or "子智能体已被强制关闭。",
+            }
+            self._save_state()
+        return response
+
     # ------------------------------------------------------------------
     # 内部工具方法
     # ------------------------------------------------------------------
diff --git a/sub_agent/web_server.py b/sub_agent/web_server.py
index 57b22d8..3728e97 100644
--- a/sub_agent/web_server.py
+++ b/sub_agent/web_server.py
@@ -2132,6 +2132,32 @@ def stop_sub_agent_task(task_id: str) -> Dict[str, Any]:
     return {"success": True, "message": "已发送停止指令"}
 
 
+def force_terminate_sub_agent(task_id: str) -> Dict[str, Any]:
+    cleanup_inactive_sub_agent_tasks()
+    task = sub_agent_tasks.get(task_id)
+    if not task:
+        return {"success": False, "error": "任务不存在"}
+
+    client_sid = task.get("last_client_sid")
+    if client_sid and client_sid in stop_flags:
+        stop_flags[client_sid]["stop"] = True
+
+    terminal = sub_agent_terminals.get(task_id)
+    if terminal:
+        try:
+            reset_system_state(terminal)
+        except Exception:
+            pass
+
+    update_sub_agent_task(task_id, status="terminated")
+    broadcast_sub_agent_event(task_id, "sub_agent_status", {
+        "status": "terminated",
+        "message": "子智能体已强制关闭"
+    })
+    _purge_sub_agent_task(task_id)
+    return {"success": True, "message": "子智能体已强制关闭"}
+
+
 # ==========================================
 # 子智能体任务API（主智能体调用，免登录）
 # ==========================================
@@ -2189,6 +2215,13 @@ def api_stop_sub_agent(task_id: str):
     return jsonify(result), status_code
 
 
+@app.route('/tasks/<task_id>/terminate', methods=['POST'])
+def api_terminate_sub_agent(task_id: str):
+    result = force_terminate_sub_agent(task_id)
+    status_code = 200 if result.get("success") else 400
+    return jsonify(result), status_code
+
+
 @app.route('/tasks/<task_id>/conversation', methods=['GET'])
 def api_get_sub_agent_conversation(task_id: str):
     info = get_task_record(task_id)