diff --git a/TODO_NEXT_STEPS.txt b/TODO_NEXT_STEPS.txt
index 763de9b..00a63d5 100644
--- a/TODO_NEXT_STEPS.txt
+++ b/TODO_NEXT_STEPS.txt
@@ -4,6 +4,7 @@
 ================================================================================
 
 【已完成】
+   - V10.218 補 `/observability/ppt_audit_history` AiderHeal 去重鎖：同一份簡報已在背景修復時，再次點擊會回「已在執行中」，避免重複開 SSH / 模型 / git 修復流程。
    - V10.217 讓 `/observability/ppt_audit_history` 的 AiderHeal 派工改為非阻塞背景任務：頁面立即回「已排入」，修復工作在背景執行，避免瀏覽器與 Gunicorn worker 等 SSH、模型與 git push 到超時。
    - V10.216 修正 `/observability/ppt_audit_history` 的 AiderHeal 派工斷點：失敗簡報即使只有 `issues_found` 診斷摘要也能一鍵送修，並修正 `execute_code_fix` 參數與 dict 回傳解析，避免按鈕 400/500。
    - V10.215 強化 `/observability/ppt_audit_history` 視覺問題追蹤：將 `issues_found` 拆成投影片、問題類型、問題文字與回放入口，新增「視覺問題追蹤」面板，讓問題簡報能直接定位與預覽。
diff --git a/config.py b/config.py
index 48b7a00..2f2c4b8 100644
--- a/config.py
+++ b/config.py
@@ -320,7 +320,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.217"
+SYSTEM_VERSION = "V10.218"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 
diff --git a/routes/admin_observability_routes.py b/routes/admin_observability_routes.py
index a212854..4e52f82 100644
--- a/routes/admin_observability_routes.py
+++ b/routes/admin_observability_routes.py
@@ -35,6 +35,9 @@ admin_observability_bp = Blueprint(
     url_prefix='/observability',
 )
 
+_PPT_AIDER_HEAL_LOCK = threading.Lock()
+_PPT_AIDER_HEAL_ACTIVE = set()
+
 
 # ─────────────────────────────────────────────────────────────────────────────
 # /observability/overview — Phase 45 總覽（單頁聚合 6 項 KPI）
@@ -1835,6 +1838,17 @@ def ppt_audit_trigger_aider_heal():
             'triggered_by': 'admin_observability',
             'issue_summary': issue_summary[:500],
         }
+        heal_key = pptx_filename or diagnosis[:160] or 'manual'
+        with _PPT_AIDER_HEAL_LOCK:
+            if heal_key in _PPT_AIDER_HEAL_ACTIVE:
+                return jsonify({
+                    'ok': True,
+                    'status': 'already_running',
+                    'action': 'CODE_FIX',
+                    'message': '這份簡報的 AiderHeal 已在背景執行中，請等 Telegram/Gitea/CD 結果回報。',
+                    'target_file': 'services/ppt_generator.py',
+                }), 202
+            _PPT_AIDER_HEAL_ACTIVE.add(heal_key)
 
         def _heal_worker():
             try:
@@ -1855,6 +1869,9 @@ def ppt_audit_trigger_aider_heal():
                     "[PPTAudit] AiderHeal 背景任務失敗 | file=%s",
                     pptx_filename or '-',
                 )
+            finally:
+                with _PPT_AIDER_HEAL_LOCK:
+                    _PPT_AIDER_HEAL_ACTIVE.discard(heal_key)
 
         thread_key = ''.join(ch for ch in pptx_filename if ch.isalnum())[:24] or 'manual'
         threading.Thread(
diff --git a/tests/test_admin_observability_routes.py b/tests/test_admin_observability_routes.py
index 9de65f4..3b9a29d 100644
--- a/tests/test_admin_observability_routes.py
+++ b/tests/test_admin_observability_routes.py
@@ -565,6 +565,51 @@ def test_ppt_audit_trigger_aider_heal_accepts_issue_summary(client, monkeypatch)
     assert captured['context']['issue_summary'] == 'S1: 圖表被切掉：右側圖例超出邊界'
 
 
+def test_ppt_audit_trigger_aider_heal_dedupes_same_file(client, monkeypatch):
+    """同一份 PPT 已在背景修復時，重複按鈕不應重開第二條 AiderHeal。"""
+    from routes import admin_observability_routes as mod
+    from services import aider_heal_executor as svc
+
+    calls = []
+
+    def fake_execute_code_fix(**kwargs):
+        calls.append(kwargs)
+        return {
+            'success': True,
+            'action': 'CODE_FIX',
+            'message': '不應在此測試執行',
+            'commit_sha': None,
+            'reverted': False,
+        }
+
+    class HoldingThread:
+        def __init__(self, target, **_kwargs):
+            self.target = target
+
+        def start(self):
+            return None
+
+    monkeypatch.setattr(svc, 'execute_code_fix', fake_execute_code_fix)
+    monkeypatch.setattr(mod.threading, 'Thread', HoldingThread)
+    mod._PPT_AIDER_HEAL_ACTIVE.clear()
+
+    payload = {
+        'pptx_filename': 'ocbot_daily_20260517.pptx',
+        'issue_summary': 'S1: 圖表被切掉：右側圖例超出邊界',
+    }
+    first = client.post('/observability/ppt_audit/trigger_aider_heal', json=payload)
+    second = client.post('/observability/ppt_audit/trigger_aider_heal', json=payload)
+
+    try:
+        assert first.status_code == 202
+        assert first.get_json()['status'] == 'queued'
+        assert second.status_code == 202
+        assert second.get_json()['status'] == 'already_running'
+        assert calls == []
+    finally:
+        mod._PPT_AIDER_HEAL_ACTIVE.clear()
+
+
 # ──────────────────────────────────────────────────────────────────────────
 # /observability/host_health
 # ──────────────────────────────────────────────────────────────────────────
diff --git a/web/static/js/observability-charts.js b/web/static/js/observability-charts.js
index 6ad8b9b..ba16cdb 100644
--- a/web/static/js/observability-charts.js
+++ b/web/static/js/observability-charts.js
@@ -596,7 +596,9 @@
         throw new Error(data.error || data.message || '觸發失敗');
       }
       if (triggerButton) {
-        triggerButton.innerHTML = '<i class="fas fa-check me-1"></i>已排入';
+        triggerButton.innerHTML = data.status === 'already_running'
+          ? '<i class="fas fa-clock me-1"></i>執行中'
+          : '<i class="fas fa-check me-1"></i>已排入';
       }
       if (statusNode) {
         statusNode.classList.remove('is-working');