diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthRepository.kt b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthRepository.kt
index 1ee9747..0fe96e5 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthRepository.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthRepository.kt
@@ -13,6 +13,8 @@ interface AuthRepository : JpaRepository<Auth, Long>, AuthQueryRepository
 interface AuthQueryRepository {
     fun getOldestCreatedAtByDi(di: String): LocalDateTime
     fun getMemberIdsByDi(di: String): List<Long>
+    fun getAuthIdByMemberId(memberId: Long): Long?
+    fun getActiveMemberIdsByDi(di: String): List<Long>
 }
 
 class AuthQueryRepositoryImpl(private val queryFactory: JPAQueryFactory) : AuthQueryRepository {
@@ -33,4 +35,25 @@ class AuthQueryRepositoryImpl(private val queryFactory: JPAQueryFactory) : AuthQ
             .where(auth.di.eq(di))
             .fetch()
     }
+
+    override fun getAuthIdByMemberId(memberId: Long): Long? {
+        return queryFactory
+            .select(auth.id)
+            .from(auth)
+            .innerJoin(auth.member, member)
+            .where(auth.member.id.eq(memberId))
+            .fetchFirst()
+    }
+
+    override fun getActiveMemberIdsByDi(di: String): List<Long> {
+        return queryFactory
+            .select(member.id)
+            .from(member)
+            .leftJoin(member.auth, auth)
+            .where(
+                auth.di.eq(di)
+                    .and(member.isActive.isTrue)
+            )
+            .fetch()
+    }
 }
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
index 76af74e..a7a09f3 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/member/auth/AuthService.kt
@@ -23,6 +23,10 @@ class AuthService(
     @Transactional
     fun verify(member: Member, request: AuthVerifyRequest) {
         val bootpay = Bootpay(bootpayApplicationId, bootpayPrivateKey)
+
+        val authId = repository.getAuthIdByMemberId(memberId = member.id!!)
+        if (authId != null) throw SodaException("이미 인증된 계정입니다.")
+
         try {
             val token = bootpay.accessToken
             if (token["error_code"] != null) throw SodaException("인증정보에 오류가 있습니다.\n다시 시도해 주세요.")
@@ -39,6 +43,14 @@ class AuthService(
                 val nowYear = LocalDate.now().year
                 val certificateYear = certificate.birth.substring(0, 4).toInt()
                 if (nowYear - certificateYear >= 19) {
+                    val memberIds = repository.getActiveMemberIdsByDi(di = certificate.di)
+                    if (memberIds.size >= 3) {
+                        throw SodaException(
+                            "이미 본인인증한 계정 ${memberIds.size}개 이용중입니다.\n" +
+                                "소다라이브의 본인인증은 최대 3개의 계정만 이용할 수 있습니다."
+                        )
+                    }
+
                     val auth = Auth(
                         name = certificate.name,
                         birth = certificate.birth,
@@ -56,7 +68,7 @@ class AuthService(
                 throw SodaException("인증정보에 오류가 있습니다.\n다시 시도해 주세요.")
             }
         } catch (e: Exception) {
-            throw SodaException("인증정보에 오류가 있습니다.\n다시 시도해 주세요.")
+            throw SodaException(e.message ?: "인증정보에 오류가 있습니다.\n다시 시도해 주세요.")
         }
     }
 }