A power switching circuit comprises a connector, a detection circuit, a first switching circuit and a first translation circuit, wherein, the connector is connected with the detection circuit and connected with a second power end on the main board through the first switching circuit and connected with a first power end on the main board; the detection circuits are respectively connected with the second power end on the main board through the first translation circuit and the first switching circuit, detect whether the power supply is in a single-ended output mode or a double-ended output modeand output corresponding control signals to control the on and off of the first switching circuit and the first translation circuit to lead the connector to provide voltage for the main board. The power switching circuit of the invention leads the main board to share single-ended and multi-ended output power supply.