diff --git a/reaction_board/notify/telegram.py b/reaction_board/notify/telegram.py
index 18f9bc1..301c566 100644
--- a/reaction_board/notify/telegram.py
+++ b/reaction_board/notify/telegram.py
@@ -98,7 +98,15 @@ class TelegramClient:
         return self._call("sendMessage", params)
 
     def send_candidates(self, candidates: Sequence[Mapping[str, Any]]) -> bool:
-        items = list(candidates)
+        # 通知器边界再做一次 aid 去重，避免调用方重复入队导致消息主体和按钮重复。
+        items: list[Mapping[str, Any]] = []
+        seen: set[int] = set()
+        for candidate in candidates:
+            aid = candidate.get("aid")
+            if aid in seen:
+                continue
+            seen.add(aid)
+            items.append(candidate)
         if not items:
             return True
         for index in range(0, len(items), MAX_CANDIDATES_PER_MESSAGE):
diff --git a/tests/test_telegram.py b/tests/test_telegram.py
index b6f6952..4e6ef8b 100644
--- a/tests/test_telegram.py
+++ b/tests/test_telegram.py
@@ -67,6 +67,18 @@ def test_send_candidates_and_chunking():
     assert len(json.loads(transport.calls[1]["data"]["reply_markup"])["inline_keyboard"]) == 1
 
 
+def test_send_candidates_dedupes_by_aid():
+    transport = FakeTransport()
+    bot = TelegramClient("token", 42, transport=transport)
+    bot.send_candidates([candidate(1), candidate(1), candidate(2)])
+    assert len(transport.calls) == 1
+    keyboard = json.loads(transport.calls[0]["data"]["reply_markup"])
+    assert len(keyboard["inline_keyboard"]) == 2
+    assert [row[0]["callback_data"] for row in keyboard["inline_keyboard"]] == [
+        "fav:1", "fav:2",
+    ]
+
+
 def test_get_updates_and_answer():
     transport = FakeTransport(result=[])
     bot = TelegramClient("token", 42, transport=transport, poll_timeout=17)
@@ -147,6 +159,7 @@ def test_poller_dispatch_and_authorization():
 def main():
     test_format_duration()
     test_send_candidates_and_chunking()
+    test_send_candidates_dedupes_by_aid()
     test_get_updates_and_answer()
     test_poller_dispatch_and_authorization()
     print("OK: Telegram 消息、分片、长轮询与回调授权测试全部通过")