Clockwork spring reset flapping door

The invention discloses a clockwork spring reset flap door which comprises a lower box seat and a door stop assembly arranged on the lower box seat, and a driving motor is fixedly installed at the bottom of an inner cavity of the lower box seat. According to the clockwork spring reset flapping door, the standby power supply assembly is arranged to serve as a standby power source of the driving motor, temporary power supply is provided for the door stop assembly, buffer time is provided for electric power overhaul, meanwhile, under the arrangement of the electromagnet and the guide plate assembly, the non-return assembly and the clockwork spring assembly are matched, and reset control over the rotating shaft is achieved; the door stop assembly can be automatically reset after the standby power supply loses power, normal passing of passengers is guaranteed, under the cooperation of a clockwork spring, a first edge chamfering plate and a second edge chamfering plate, automatic reset and constant reset torque of