diff --git a/acceptance_service.py b/acceptance_service.py
index 8bbbbff..f452f07 100644
--- a/acceptance_service.py
+++ b/acceptance_service.py
@@ -840,13 +840,22 @@ def _poll_screenshot_results(public_id: str) -> None:
 
 
 def retry_failed_acceptance_devices(public_id: str) -> dict[str, Any]:
-    """仅对截图失败的“关键词 × 设备”组合重新立即下发。"""
+    """补采失败及批次开始后新增的设备，仍写入原自然日批次。"""
     with connection() as conn:
         task = conn.execute(
             "SELECT * FROM acceptance_tasks WHERE public_task_id=?", (public_id,),
         ).fetchone()
         if not task:
             raise TaskError("ACCEPTANCE_TASK_NOT_FOUND", "验收任务不存在", 404)
+        if task["batch_date"]:
+            batch_day = datetime.strptime(task["batch_date"], "%Y-%m-%d").date()
+            today = datetime.now().astimezone().date()
+            if today > batch_day + timedelta(days=1):
+                raise TaskError(
+                    "ACCEPTANCE_RETRY_WINDOW_EXPIRED",
+                    f"{task['batch_date']} 批次仅允许在批次当天或次日重采",
+                    409,
+                )
         if task["acceptance_method"] not in {"screenshot", "combined"}:
             raise TaskError("SCREENSHOT_RETRY_NOT_SUPPORTED", "该任务不包含截图采集", 409)
         rows = conn.execute(
@@ -878,8 +887,24 @@ def retry_failed_acceptance_devices(public_id: str) -> dict[str, Any]:
         )
         if status in terminal_failures or (status == "completed" and not has_screenshot):
             failed_by_keyword.setdefault(keyword, []).append(account_id)
+    active_device_ids = {
+        str(item.get("xhs_account_id") or "").strip()
+        for item in list_xhs_wen_xapi_devices()
+        if str(item.get("xhs_account_id") or "").strip()
+    }
+    for keyword in keyword_runs:
+        collected_ids = {
+            account_id for (row_keyword, account_id) in latest if row_keyword == keyword
+        }
+        missing_ids = active_device_ids - collected_ids
+        if missing_ids:
+            failed_by_keyword.setdefault(keyword, []).extend(sorted(missing_ids))
+    failed_by_keyword = {
+        keyword: list(dict.fromkeys(account_ids))
+        for keyword, account_ids in failed_by_keyword.items() if account_ids
+    }
     if not failed_by_keyword:
-        raise TaskError("NO_FAILED_SCREENSHOT_DEVICES", "当前没有可重新采集的失败设备", 409)
+        raise TaskError("NO_FAILED_SCREENSHOT_DEVICES", "当前没有失败或新增设备需要补采", 409)
 
     dispatched_devices: set[str] = set()
     dispatched_pairs = 0
@@ -1705,6 +1730,10 @@ def _task_dict(conn, task) -> dict[str, Any]:
         "dashboard_batch_key": task["dashboard_batch_key"],
         "use_all_devices": bool(task["use_all_devices"]),
         "batch_date": task["batch_date"],
+        "retry_deadline": (
+            (datetime.strptime(task["batch_date"], "%Y-%m-%d").date() + timedelta(days=1)).isoformat()
+            if task["batch_date"] else None
+        ),
         "schedule_enabled": bool(task["schedule_enabled"]),
         "schedule_weekday": task["schedule_weekday"],
         "schedule_weekdays": _decode_json(task["schedule_weekdays"], None) or (
diff --git a/apifox-business-tasks.openapi.json b/apifox-business-tasks.openapi.json
index 08e81ef..0ee83d6 100644
--- a/apifox-business-tasks.openapi.json
+++ b/apifox-business-tasks.openapi.json
@@ -99,8 +99,8 @@
     },
     "/api/v1/acceptance-tasks/{task_id}/retry-failed-devices": {
       "post": {
-        "summary": "重新采集全部失败截图设备",
-        "description": "按每个关键词读取最新 XAPI 结果，仅将失败、取消、异常或已完成但无截图的设备精确重新下发。成功设备不会重复执行，新批次继续归入原验收任务。",
+        "summary": "补采失败及新增截图设备",
+        "description": "按关键词补采失败设备，以及批次完成后新加入设备库但尚未参与该批次的设备。结果仍归原日期批次；只允许在批次当天和次日执行。",
         "tags": ["项目验收"],
         "parameters": [{"$ref": "#/components/parameters/TaskId"}],
         "responses": {
diff --git a/tests/test_acceptance_creation.py b/tests/test_acceptance_creation.py
index ce645b1..1cb68c2 100644
--- a/tests/test_acceptance_creation.py
+++ b/tests/test_acceptance_creation.py
@@ -174,9 +174,14 @@ class AcceptanceCreationTest(unittest.TestCase):
 
     @patch("acceptance_service.threading.Thread", _ThreadWithoutStart)
     @patch("acceptance_service.schedule_xapi_screenshots")
+    @patch("acceptance_service.list_xhs_wen_xapi_devices")
     @patch("acceptance_service.get_wen_resources")
-    def test_retry_failed_devices_dispatches_only_failed_accounts(self, resources, schedule):
+    def test_retry_failed_devices_dispatches_only_failed_accounts(self, resources, devices, schedule):
         resources.return_value = {"cookie_count": 0, "device_count": 2}
+        devices.return_value = [
+            {"xhs_account_id": "failed-account"},
+            {"xhs_account_id": "successful-account"},
+        ]
         schedule.return_value = {
             "execution_mode": "immediate",
             "batches": [{