A processing method for piecing together a fingerprint based on a mobile terminal and a mobile terminal are disclosed. The method includes: acquiring fingerprint information of a user via a fingerprint multiplexing button; comparing the fingerprint information of the user with fingerprint information which is stored in advance; unlocking the mobile terminal if the fingerprint information of the user matches the fingerprint information which is stored in advance; and locking the mobile terminal and prompting the current operating user to re-input fingerprint information to unlock the mobile terminal if the fingerprint information of the current operating user is inconsistent with the fingerprint information which is stored in advance. When the user utilizes the mobile terminal, a fingerprint match is performed. If different, the mobile terminal is locked for increasing the safety of the information.