Standby Power Supply Circuit and Control Method Thereof

The present application discloses a standby power supply circuit and a control method thereof, relates to a power supply circuit. The standby power supply circuit comprises: a first interface, at least one second interface, an input-output circuit, a DC conversion circuit, a control unit, and a standby power supply; wherein the first interface is connected to an input end of the input-output circuit, and the at least one second interface is connected to an output end of the input-output circuit; a first end of the DC conversion circuit is connected to the standby power supply, and a second end of the DC conversion circuit is connected to the input-output circuit; the control unit is connected to the first interface, the at least one second interface, the input-output circuit and the DC conversion circuit respectively.