Power switch capable of being automatically turned off in delayed time

The invention discloses a power switch capable of being automatically turned off in delayed time. A cylinder piston type button and a non-return valve are adopted by the switch, the circuit can be turned on after the button is pressed down, and the circuit can be automatically turned off after the button is loosened. The power switch disclosed by the invention is an ideal power-saving automatic switch in short power utilization for door lamps, street lamps and exposure lamps, and is an ideal electric appliance for the building. 种延时自动关闭用电开关，采用了气缸活塞式按扭和逆止气阀，能按下按扭后接通电路，松开按扭后延时自动断开电路，是种门灯、过路灯、曝光灯等短时用电的理想节电自动开关和理想的建筑用电器。