The invention discloses an electric operating wrench. A battery fixing rack is a hollow pipe; the hollow pipe of the fixing rack is provided with an open slot for containing a battery switch; a motoris arranged at the front end of the hollow pipe; a battery is arranged in a battery box; the bottom of the battery box is arranged on the hollow pipe in a sleeving mode and provided with an opening communicating with the open slot in the hollow pipe of the fixing rack; a pull rope for pulling the switch is arranged at an inner cavity of an insulating operating rod, and the front end of the pull rope is arranged on the periphery of the switch in a sleeving mode; the battery fixing rack is arranged at the front end of the insulating rod connected with the battery fixing rack in a sleeving mode;the front end of the insulating rod is sealed, and two holes are formed in the front end face of the insulating rod; and the pull rope penetrates into the inner cavity of the battery fixing rack via one hole in the front end face of the insulating rod, rotates around the switch by one or more turns, then penetrates out of the other hole in the front end face of the insulating rod and is knotted inthe insulating rod. By arranging the insulating rope inside to drag a motor switch, the tail end of the insulating rope is fixed to an operating handle, and the electric wrench can be remotely controlled to be started.