Once a fire emergency occurs in a public place, the control center will give the door lock a fire linkage signal, and the voice alarm installed on the door lock will issue a voice alarm and siren sound of “This is an emergency exit, please evacuate quickly”; A warning light attached to the door lock emits an optional laser flashing light. When people escape, as long as they touch any position of the door lock push rod, the door can be opened, and a large number of people can be quickly evacuated in the first time.