The invention belongs to the technical field of mobile terminals and relates to a screen wake-up method and a screen wake-up device. The method includes: capturing sound signals; judging whether the sound signals are click sound signals for waking up a screen of a mobile terminal or not; if yes, lighting the screen of the mobile terminal. The screen wake-up method and the screen wake-up device are used for waking up the screen of the mobile terminal, solve the problem of single means in screen wakeup and enrich screen wake-up ways.