Automatic power-off device

The utility model discloses an automatic power-off device, which belongs to the field of power control and comprises a power supply module and a controller, a first control input end of the controller is electrically connected with an adjusting module, and a second control input end of the controller is electrically connected with a timing module. A third control input end of the controller is electrically connected with a detection module, a first output end of the controller is electrically connected with an execution module, a second output end of the controller is electrically connected with a display module, and a third output end of the controller is electrically connected with a background system. The power supply module is electrically connected with the controller, the adjusting module, the timing module, the execution module, the display module, the detection module and the background system, whether office personnel and dormitory students leave or not can be detected, a timing function is needed, a