The utility model discloses an automatically restarting device that transformer substation used, it include by detection module with restart module circuit board, included power, host computer CPU unit and host communication unit by detection module, the module circuit board that restarts include relay control circuit, single chip microcomputer, watchdog, communication circuit, stator indicator and LED pilot lamp, the port I of power be connected with host computer CPU's input, host computer CPU's the output and the input of host communication unit are connected, the output of host communication unit is connected through the input port I of communication circuit with single chip microcomputer, the port II and relay control circuit's the input of power are connected, relay control circuit's output is connected with single chip microcomputer's input port II, single chip microcomputer's output port is connected with stator indicator and LED pilot lamp in proper order.