USB (Universal Serial Bus) flash disk encryption-based data access method and system

The invention discloses a USB (Universal Serial Bus) flash disk encryption-based data access method and a USB flash disk encryption-based data access system. The method comprises the following steps: step 1) a USB flash disk initializing step: generating a VVMF (Virtual Volume Mapping File) on an ordinary USB flash disk, and inputting a password to encrypt the VVMF; step 2), a data reading step, receiving the password input by a user, and comparing whether the password is the same as an encrypted password of the VVMF; invoking a group of system driving files pre-stored in the USB flash disk to generate volume equipment if the password is correct, loading a drive letter of the volume equipment in a system drive letter catalogue, and further carrying out the corresponding data reading and writing according to user operation.