Power socket capable of automatically powering off

The invention relates to a power socket, especially to a power socket capable of automatically powering off. The power socket consists of a socket body, a maintenance signal acquisition circuit, a button switch, a regulated power supply circuit, a power-on timing circuit, and an execution circuit. The regulated power supply circuit supplies power to a whole control circuit. The maintenance signalacquisition circuit consists of a mutual inductance coil, a rectification element and a filter element. When the button switch is pressed and a computer is started, The maintenance signal acquisitioncircuit sends induced electromotive force generated by the mutual inductance coil to the execution circuit after rectification and filtering, and so a relay is sucked and the socket body and the control circuit are powered up. When a system of the computer is turned off, a current on a power line is reduced, the induced electromotive force generated by the mutual inductance coil is reduced, the relay is released, and the s