The invention discloses a power supply control circuit which comprises a trigger and a triode Q2, wherein a pin of the trigger is connected to a metal oxide semiconductor (MOS) transistor Q5; a pin R of the trigger is connected with a level control circuit; a pin CLK of the trigger is connected with a collector of the triode Q2; an emitter of the triode Q2 is grounded; a grounding end of the emitter of the triode Q2 is connected in series with a switch K1 through a resistor R5; a base of the triode Q2 is connected with the switch K1 through a resistor R4; a switch on-off detection circuit is connected between the resistor R4 and the switch K1; a capacitor E2 is connected between the base of the triode Q2 and the resistor R5; a resistor R6 and a resistor R7 which are connected in series with each other are connected between the base of the triode Q2 and the pin CLK of the trigger; an external power supply PWR-CON is connected between the resistor R6 and the resistor R7; the external power supply PWR-CON is also connected with a pin D of the trigger. According to the power supply control circuit, an effect of well protecting a battery can be achieved, and startup and shutdown can be delayed.