The invention provides a power supply socket used for providing power supply for a main electric appliance and a plurality of subsidiary electric appliances, which comprises a power supply plug, a main power supply socket, a plurality of coupling power supply sockets and a control circuit which is electrically connected with the main power supply socket and a plurality of coupling power supply sockets and comprises an inductor, a magnetic reed switch and a switch circuit; wherein, when the main electric appliance is started, the current value of the inductor current through the inductor is higher than the default value of the current, which causes the magnetic reed switch to be started and the switch circuit to be shut down and a plurality of subsidiary electric appliances connected with the coupling power supply sockets to be started; when the main electric appliance is shut down, the current value of the inductor current through the inductor is smaller than the default value of the current, which causes the magnetic reed switch to be shut down and the switch circuit to be started and the subsidiary electric appliances connected with the coupling power supply sockets to be shut down.