File transmission method and relevant device and transmission system

Embodiments of the invention disclose a file transmission method and a relevant device and a transmission system. The method comprises: obtaining a first fingerprint input by a user in a fingerprint identification area of a mobile terminal; sending the first fingerprint to a server; and receiving an encrypted file sent by the server, wherein the encrypted file is obtained by the server by using a preset fingerprint encryption file after judging that the first fingerprint is not matched with a preset fingerprint corresponding to a pre-stored file. The file transmission method disclosed by the embodiments of the invention is beneficial to improve the security of file transmission.