Data encryption and decryption methods and mobile terminal

An embodiment of the present invention discloses a data encryption method, comprising: reading data stored in a mobile terminal; performing first encryption processing on the data according to a first encryption algorithm and a first key, to obtain a first encryption data; performing second encryption processing on the first encryption data according to a second encryption algorithm and a second key, to obtain a second encryption data; wherein the first key is identification information of the mobile terminal and the second key is fingerprint information input by a user, or, the second key is identification information of the mobile terminal and the first key is fingerprint information input by a user. By adopting the embodiment of the present invention, the identification information of the mobile terminal and the fingerprint information set by the user for the data are separately taken as keys, and double encryption processing is performed on the data in the mobile terminal, so that data security is improved.