diff --git a/app/social/api/routers/v1/oauth.py b/app/social/api/routers/v1/oauth.py
index 4688de0..3919e6d 100644
--- a/app/social/api/routers/v1/oauth.py
+++ b/app/social/api/routers/v1/oauth.py
@@ -62,6 +62,7 @@ def _build_redirect_url(is_success: bool, params: dict) -> str:
 async def start_connect(
     platform: SocialPlatform,
     current_user: User = Depends(get_current_user),
+    session: AsyncSession = Depends(get_session),
 ) -> SocialConnectResponse:
     """
     소셜 계정 연동 시작
@@ -77,6 +78,7 @@ async def start_connect(
     return await social_account_service.start_connect(
         user_uuid=current_user.user_uuid,
         platform=platform,
+        session=session,
     )
 
 
diff --git a/app/social/oauth/base.py b/app/social/oauth/base.py
index 3472030..f2b457e 100644
--- a/app/social/oauth/base.py
+++ b/app/social/oauth/base.py
@@ -24,12 +24,13 @@ class BaseOAuthClient(ABC):
     platform: SocialPlatform
 
     @abstractmethod
-    def get_authorization_url(self, state: str) -> str:
+    def get_authorization_url(self, state: str, force_consent: bool = False) -> str:
         """
         OAuth 인증 URL 생성
 
         Args:
             state: CSRF 방지용 state 토큰
+            force_consent: True면 동의 화면 강제 표시 (refresh_token 재발급 필요 시)
 
         Returns:
             str: OAuth 인증 페이지 URL
diff --git a/app/social/oauth/youtube.py b/app/social/oauth/youtube.py
index e2b89e2..92196f4 100644
--- a/app/social/oauth/youtube.py
+++ b/app/social/oauth/youtube.py
@@ -43,12 +43,13 @@ class YouTubeOAuthClient(BaseOAuthClient):
         self.client_secret = social_oauth_settings.YOUTUBE_CLIENT_SECRET
         self.redirect_uri = social_oauth_settings.YOUTUBE_REDIRECT_URI
 
-    def get_authorization_url(self, state: str) -> str:
+    def get_authorization_url(self, state: str, force_consent: bool = False) -> str:
         """
         Google OAuth 인증 URL 생성
 
         Args:
             state: CSRF 방지용 state 토큰
+            force_consent: True면 동의 화면 강제 표시하여 refresh_token 재발급
 
         Returns:
             str: Google OAuth 인증 페이지 URL
@@ -58,12 +59,12 @@ class YouTubeOAuthClient(BaseOAuthClient):
             "redirect_uri": self.redirect_uri,
             "response_type": "code",
             "scope": " ".join(YOUTUBE_SCOPES),
-            "access_type": "offline",  # refresh_token 받기 위해 필요
-            "prompt": "select_account",  # 계정 선택만 표시 (동의 화면은 최초 1회만)
+            "access_type": "offline",
+            "prompt": "consent" if force_consent else "select_account",
             "state": state,
         }
         url = f"{self.AUTHORIZATION_URL}?{urlencode(params)}"
-        logger.debug(f"[YOUTUBE_OAUTH] 인증 URL 생성: {url[:100]}...")
+        logger.debug(f"[YOUTUBE_OAUTH] 인증 URL 생성 - force_consent: {force_consent}, url: {url[:100]}...")
         return url
 
     async def exchange_code(self, code: str) -> OAuthTokenResponse:
diff --git a/app/social/services/account_service.py b/app/social/services/account_service.py
index 0947ad0..0c45a93 100644
--- a/app/social/services/account_service.py
+++ b/app/social/services/account_service.py
@@ -59,15 +59,18 @@ class SocialAccountService:
         self,
         user_uuid: str,
         platform: SocialPlatform,
+        session: AsyncSession,
     ) -> SocialConnectResponse:
         """
         소셜 계정 연동 시작
 
         OAuth 인증 URL을 생성하고 state 토큰을 저장합니다.
+        기존 연동 계정에 refresh_token이 없으면 동의 화면을 강제 표시합니다.
 
         Args:
             user_uuid: 사용자 UUID
             platform: 연동할 플랫폼
+            session: DB 세션
 
         Returns:
             SocialConnectResponse: OAuth 인증 URL 및 state 토큰
@@ -77,10 +80,19 @@ class SocialAccountService:
             f"user_uuid: {user_uuid}, platform: {platform.value}"
         )
 
-        # 1. state 토큰 생성 (CSRF 방지)
+        # 1. 기존 계정의 refresh_token 존재 여부 확인
+        existing_account = await self.get_account_by_platform(user_uuid, platform, session)
+        force_consent = not (existing_account and existing_account.refresh_token)
+        logger.debug(
+            f"[SOCIAL] OAuth prompt 결정 - force_consent: {force_consent}, "
+            f"has_account: {existing_account is not None}, "
+            f"has_refresh_token: {bool(existing_account and existing_account.refresh_token)}"
+        )
+
+        # 2. state 토큰 생성 (CSRF 방지)
         state = secrets.token_urlsafe(32)
 
-        # 2. state를 Redis에 저장 (user_uuid 포함)
+        # 3. state를 Redis에 저장 (user_uuid 포함)
         state_key = f"{self.STATE_KEY_PREFIX}{state}"
         state_data = {
             "user_uuid": user_uuid,
@@ -89,13 +101,13 @@ class SocialAccountService:
         await redis_client.setex(
             state_key,
             social_oauth_settings.OAUTH_STATE_TTL_SECONDS,
-            json.dumps(state_data),  # JSON으로 직렬화
+            json.dumps(state_data),
         )
         logger.debug(f"[SOCIAL] OAuth state 저장 - key: {state_key}")
 
-        # 3. OAuth 클라이언트에서 인증 URL 생성
+        # 4. OAuth 클라이언트에서 인증 URL 생성
         oauth_client = get_oauth_client(platform)
-        auth_url = oauth_client.get_authorization_url(state)
+        auth_url = oauth_client.get_authorization_url(state, force_consent=force_consent)
 
         logger.info(f"[SOCIAL] OAuth URL 생성 완료 - platform: {platform.value}")