diff --git a/dao/file.go b/dao/file.go
index 058a832..96e4428 100644
--- a/dao/file.go
+++ b/dao/file.go
@@ -1,6 +1,9 @@
 package dao
 
-import "gorm.io/gorm"
+import (
+	"gorm.io/gorm"
+	"videoplayer/proto"
+)
 
 type File struct {
 	gorm.Model
@@ -12,6 +15,7 @@ type File struct {
 	FileType      string `gorm:"column:file_type"`
 	FilePath      string `gorm:"column:file_path"`
 	AuthID        int    `gorm:"column:auth_id"`
+	Md5           string `gorm:"column:md5;type:varchar(255);uniqueIndex:idx_file_name"`
 }
 
 func CreateFile(fileStoreName, fileName, fileType, filePath string, fileSize, authID int, NeedAuth bool) uint {
@@ -82,3 +86,13 @@ func DeleteFileById(id int) bool {
 	}
 	return true
 }
+
+func FindFileByMd5(md5 string) File {
+	var file File
+	if proto.Config.SERVER_SQL_LOG {
+		DB.Debug().Where("md5 = ?", md5).First(&file)
+	} else {
+		DB.Where("md5 = ?", md5).First(&file)
+	}
+	return file
+}
diff --git a/handler/tool.go b/handler/tool.go
index c6f85d6..9b75745 100644
--- a/handler/tool.go
+++ b/handler/tool.go
@@ -142,6 +142,20 @@ func UploadFile(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"error": "upload file failed", "code": proto.UploadFileFailed, "message": "failed"})
 		return
 	}
+	//计算文件md5值
+	file_, _ := file.Open()
+	md5Value := service.CalculateFileMd5(file_)
+	if md5Value == "" {
+		c.JSON(http.StatusOK, gin.H{"error": "计算文件MD5值失败", "code": proto.UploadFileFailed, "message": "failed"})
+		return
+	}
+	//查询文件是否已存在
+	fileExist := dao.FindFileByMd5(md5Value)
+	if fileExist.ID != 0 {
+		fileExist.FilePath = ""
+		c.JSON(http.StatusOK, gin.H{"code": proto.SuccessCode, "message": "success", "data": fileExist})
+		return
+	}
 
 	//保存文件
 	filePath, fileStoreName, err := service.SaveFile(c, file, uploadType)
diff --git a/service/fileService.go b/service/fileService.go
index 00ca429..ee75bd6 100644
--- a/service/fileService.go
+++ b/service/fileService.go
@@ -1,8 +1,11 @@
 package service
 
 import (
+	"crypto/md5"
+	"fmt"
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
+	"io"
 	"mime/multipart"
 	"os"
 	"path"
@@ -34,7 +37,6 @@ func SaveFile(c *gin.Context, file *multipart.FileHeader, uploadType string) (st
 	//生成文件路径
 	path_ := getFilePath(proto.FILE_BASE_DIR)
 	filePath := path_ + "/" + fileStoreName
-
 	//保存文件
 	if err := c.SaveUploadedFile(file, filePath); err != nil {
 		return "", "", err
@@ -45,3 +47,11 @@ func SaveFile(c *gin.Context, file *multipart.FileHeader, uploadType string) (st
 
 	return path_, fileStoreName, nil
 }
+
+func CalculateFileMd5(file io.Reader) string {
+	hash := md5.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return ""
+	}
+	return fmt.Sprintf("%x", hash.Sum(nil))
+}