The application discloses an electric actuating mechanism having an electrical fault detection function. The electric actuating mechanism has an electric actuating mechanism box, an electric actuating mechanism body disposed in the electric actuating mechanism box and provided with a plurality of fault points, a multi-holes plug connected with the plurality of the fault points on the electric actuating mechanism body, a plurality of switches connected with the multi-holes plug via wires and used to simulate disconnection of the plurality of the fault points, and an operation panel used for switch installation and provided with an electric actuating mechanism control circuit diagram. The structure adopts a split type design, fault setting is transferred from in a box body of the electric actuating mechanism to in a fault quick setting device by employing failovers, the problems that fault setting exhibits a long time, low efficiency, a poor fault concealment effect and the like during the fault setting are solved. Therefore, the line fault points of a control circuit in the electric actuating mechanism can be set simply through connections and disconnections of the switches, and the fault setting is easy, convenient and time-saving.