A high voltage power electronic isolating switch that can be closed and opened automatically or by remote control, which comprises a electronic PT for monitoring operation power source, a direct- current system, a computer controller that can receive signals, a high voltage part formed by the electromagnetic mechanism and the contact system as well as a remote-control emitter directly operated by the working personnel; and is also equipped with a close resisting device with functions of preventing the isolating switch disconnecting with load and mistake close of the switch. The electromagnetic valve is controlled by the controller and drives the movable contact of the isolating switch to move, so the open and close functions are realized; the controller also controls the locking mechanism for preventing the mistake switching-on and switching-off with load, the high work reliability is guaranteed. Under the situation of power-cut or equipment failure, the detachable type manual on-off device is available, which can be operated by manpower.