The invention discloses a mobile terminal and a wake lock control method and system thereof. State detection is carried out on the mobile terminal; if the mobile terminal is in a running state, release operation is not executed on a wake lock; if the mobile terminal is in a stand-by state, property detection is further carried out on an application program with the wake lock in the mobile terminal, and release operation is not executed on the wake lock if the application program belongs to a system process or white list; if not, overtime detection is carried out on the application program with the wake lock in the mobile terminal, and if the wake lock using time of the application program does not exceed a preset time range, release operation is not executed on the wake lock, and overtime detection continues to be carried out on the application program; if the wake lock using time of the application program exceeds the preset time range, the wake lock of the application program is released. Mobile phone energy consumption is reduced, the running time is prolonged, and user experience is improved.