diff --git a/src/main/java/synk/meeteam/domain/auth/api/AuthController.java b/src/main/java/synk/meeteam/domain/auth/api/AuthController.java
index dab90f07..a97e3f4d 100644
--- a/src/main/java/synk/meeteam/domain/auth/api/AuthController.java
+++ b/src/main/java/synk/meeteam/domain/auth/api/AuthController.java
@@ -90,6 +90,7 @@ public ResponseEntity<AuthUserResponseDto.login> signUp(
 
         AuthUserVo vo = AuthUserVo.of(user, user.getPlatformType(), user.getAuthority(), AuthType.SIGN_UP);
         AuthUserResponseDto.login responseDTO = jwtService.issueToken(vo);
+        mailService.deleteTemporaryUser(requestDto.emailCode());
 
         return ResponseEntity.status(HttpStatus.CREATED).body(responseDTO);
     }
diff --git a/src/main/java/synk/meeteam/domain/auth/exception/AuthExceptionType.java b/src/main/java/synk/meeteam/domain/auth/exception/AuthExceptionType.java
index 1039b2f5..1930b29c 100644
--- a/src/main/java/synk/meeteam/domain/auth/exception/AuthExceptionType.java
+++ b/src/main/java/synk/meeteam/domain/auth/exception/AuthExceptionType.java
@@ -15,6 +15,7 @@ public enum AuthExceptionType implements ExceptionType {
     INVALID_ACCESS_TOKEN(HttpStatus.BAD_REQUEST, "유효하지 않은 액세스 토큰입니다."),
     INVALID_REFRESH_TOKEN(HttpStatus.BAD_REQUEST, "유효하지 않은 리프레시 토큰입니다."),
     INVALID_MAIL_SERVICE(HttpStatus.BAD_REQUEST, "메일 서비스를 이용할 수 없는 형식입니다."),
+    INVALID_ACCESS(HttpStatus.BAD_REQUEST, "올바르지 않는 요청입니다."),
     INVALID_VERIFY_MAIL(HttpStatus.BAD_REQUEST, "잘못된 이메일 코드 입니다."),
     INVALID_MAIL_REGEX(HttpStatus.BAD_REQUEST, "학교 도메인과 유저의 도메인이 다릅니다."),
 
diff --git a/src/main/java/synk/meeteam/domain/auth/service/AuthService.java b/src/main/java/synk/meeteam/domain/auth/service/AuthService.java
index a89cf120..8f454f02 100644
--- a/src/main/java/synk/meeteam/domain/auth/service/AuthService.java
+++ b/src/main/java/synk/meeteam/domain/auth/service/AuthService.java
@@ -1,10 +1,13 @@
 package synk.meeteam.domain.auth.service;
 
+import static synk.meeteam.domain.auth.exception.AuthExceptionType.INVALID_ACCESS;
+
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import synk.meeteam.domain.auth.dto.request.AuthUserRequestDto;
 import synk.meeteam.domain.auth.dto.request.VerifyEmailRequestDto;
+import synk.meeteam.domain.auth.exception.AuthException;
 import synk.meeteam.domain.auth.service.vo.AuthUserVo;
 import synk.meeteam.domain.common.department.entity.Department;
 import synk.meeteam.domain.common.department.repository.DepartmentRepository;
@@ -72,7 +75,12 @@ public void updateUniversityInfo(VerifyEmailRequestDto requestDTO, String email)
     }
 
     @Transactional
-    public User createSocialUser(UserVO userVO, String nickName) {
+    public User createSocialUser(UserVO userVO, String nickname) {
+        // 닉네임 검사
+        if(userRepository.findByNickname(nickname).isPresent()){
+            throw new AuthException(INVALID_ACCESS);
+        }
+
         University foundUniversity = universityRepository.findByIdOrElseThrowException(
                 userVO.getUniversityId());
         Department foundDepartment = departmentRepository.findByIdOrElseThrowException(
@@ -81,7 +89,7 @@ public User createSocialUser(UserVO userVO, String nickName) {
         User newUser = User.builder()
                 .universityEmail(userVO.getEmail())
                 .name(userVO.getName())
-                .nickname(nickName)
+                .nickname(nickname)
                 .phoneNumber(userVO.getPhoneNumber())
                 .admissionYear(userVO.getAdmissionYear())
                 .university(foundUniversity)
diff --git a/src/main/java/synk/meeteam/infra/mail/MailService.java b/src/main/java/synk/meeteam/infra/mail/MailService.java
index 16b97612..9dec00e5 100644
--- a/src/main/java/synk/meeteam/infra/mail/MailService.java
+++ b/src/main/java/synk/meeteam/infra/mail/MailService.java
@@ -137,4 +137,10 @@ public void sendApproveMail(Long postId, RecruitmentApplicant recruitmentApplica
     public UserVO verify(String emailCode) {
         return redisUserRepository.findByEmailCodeOrElseThrowException(emailCode);
     }
+
+    @Transactional
+    public void deleteTemporaryUser(String emailCode) {
+        UserVO userVO = redisUserRepository.findByEmailCodeOrElseThrowException(emailCode);
+        redisUserRepository.delete(userVO);
+    }
 }