File transmission method and device

The invention discloses a file transmission method and device, and the method comprises the steps: receiving an asynchronous uploading request sent by a front end, and receiving a plurality of fragmented files uploaded by the front end after responding to the asynchronous uploading request; wherein the plurality of fragmented files are generated in a manner of fragmenting the transmission file by the front end; performing multi-thread storage on the plurality of fragment files, generating a file storage execution result, and sending the file storage execution result to a front end; receiving a file merging request sent by the front end, and merging the plurality of fragment files based on the file merging request to generate a storage file; wherein the file merging request is generated by the front end based on a file storage execution result. According to the method, the file transmission speed is increased, the problem that the synchronization request user waits for timeout is avoided, the user carries out