diff --git a/core/task_manager.py b/core/task_manager.py
index b79a5b4..f83a5cd 100644
--- a/core/task_manager.py
+++ b/core/task_manager.py
@@ -723,6 +723,16 @@ class TaskManager:
         worker_status = {w["serial"]: w for w in get_all_worker_status()}
         running = self.get_running()
 
+        # 清理陈旧状态：serial 已不在 STF 设备池、且没有在跑 worker 的条目，
+        # 避免设备被删除后其失败记录仍残留在"异常汇总"里
+        present = {dev.get("serial", "") for dev in all_devices}
+        for serial, w in list(worker_status.items()):
+            if serial in present or serial in running:
+                continue
+            if w.get("status") in ("running", "connecting"):
+                continue
+            _remove_worker(serial)
+
         result = []
         for dev in all_devices:
             serial = dev.get("serial", "")
diff --git a/web_server.py b/web_server.py
index af85996..a0ccfb7 100644
--- a/web_server.py
+++ b/web_server.py
@@ -158,6 +158,15 @@ def api_summary():
     """
     try:
         sts = get_all_worker_status()
+        # 已删除/不在当前 STF 设备池的设备，其陈旧失败记录不应展示。
+        # 复用 get_status 缓存（顺带触发上面的状态清理），STF 异常时不隐藏任何记录。
+        try:
+            devices, derr = mgr.get_status()
+            if not derr:
+                present = {d.get("serial") for d in devices}
+                sts = [s for s in sts if s.get("serial") in present]
+        except Exception:
+            pass
         counts = {"total": 0, "running": 0, "done": 0,
                   "error": 0, "failed": 0, "idle": 0}
         errors = []