The utility model provides a switching on and shutting down circuit that possesses low -voltage shutdown function, the switching on and shutting down circuit includes: a schmidt trigger, the button is connected to a schmidt trigger's input, and the CLK foot of D trigger is connected to the output, the D trigger, (img file='DDA0001147711300000011. TIF'wi='45'he='62' /) foot is connected to the D foot of D trigger, and electronic switch is connected to the Q foot, an electronic switch, electronic switch is according to start of received signal or shutdown, a comparator, whether the voltage of comparator monitoring power is less than or is higher than the setting value, the output connection of comparator the SET foot or the RST foot of D trigger. The utility model has the advantages of low power dissipation, good reliability, applicable voltage range are extensively.