Embedded device flash file system encryption method

The invention provides an embedded device flash file system encryption method which includes that during flash file mapping process, file information data of a flash file are encrypted in an encryption algorithm; and at the flash file mounting stage, the file information data of the flash file are decrypted in a decryption algorithm corresponding to the encryption algorithm and then are mounted. The embedded device flash file system encryption method can encrypt a mapping file of the flash file of an embedded device, leads the mapping file not to be mounted and not to be read, and accordingly has the secret keeping effect.