A lock plug with an electric motor wherein the lock plug comprises a lock plug body and the electric motor, wherein the electric motor is mounted at an end of the lock plug body, the lock plug body comprises a lock plug core and a lock plug case, the electric motor is fixedly connected to the lock plug core, and an overall dimension of the electric motor is smaller than that of a lock plug hole groove of a door, characterized in that: the centre, corresponding to an electric motor output shaft, of the lock plug core is provided with a semicircular hole groove with the same shape and size as those of the electric motor output shaft, the lock plug core is provided with a set screw hole, and a position, corresponding to the set screw hole, of the electric motor output shaft is provided with a set screw groove; the electric motor and an electric motor sleeve are positioned through a jump ring,, the electric motor lock plug further comprises an electric motor sleeve and a cover plate sleeve frame, wherein at least one limitation bulge is arranged outside the electric motor sleeve, a hole groove corresponding to an electric motor housing in shape is arranged inside the electric motor sleeve, an insertion hole adapting to the periphery of the electric motor sleeve is arranged on the cover plate sleeve frame, and a limitation groove corresponding to the limitation bulge is arranged on the cover plate sleeve frame, an electric motor conductive contact sleeve insulated from the electric motor is arranged on a surface of an electric motor reducer, wherein the electric motor conductive contact sleeve comprises an inner layer insulation sleeve and an outer layer conductive layer, wherein the inner layer insulation sleeve covers the surface of the electric motor reducer, the outer layer conductive layer is sleeved on the inner layer insulation sleeve, the outer layer conductive layer is electrically connected to one power supply connection point of the electric motor, the other power supply connection point of the electric motor is electrically connected to the electric motor housing, and a power supply elastic sheet is arranged at one side, close to the outer layer conductive layer, of a bottom of the lock plug body, the power supply elastic sheet being in elastic contact with outer layer conductive layer, and the electric motor housing is electrically connected to the electric motor output shaft through an internally connected mechanical gear, the electric motor output shaft and the lock plug core are electrically interconnected as well, the lock plug core and lock plug case are further electrically interconnected, such that the power supply connection point connected to the electric motor housing is caused to be electrically interconnected through the mechanical gear, the electric motor output shaft, the lock plug core and the lock plug case. the centre, corresponding to an electric motor output shaft, of the lock plug core is provided with a semicircular hole groove with the same shape and size as those of the electric motor output shaft, the lock plug core is provided with a set screw hole, and a position, corresponding to the set screw hole, of the electric motor output shaft is provided with a set screw groove; the electric motor and an electric motor sleeve are positioned through a jump ring,, the electric motor lock plug further comprises an electric motor sleeve and a cover plate sleeve frame, wherein at least one limitation bulge is arranged outside the electric motor sleeve, a hole groove corresponding to an electric motor housing in shape is arranged inside the electric motor sleeve, an insertion hole adapting to the periphery of the electric motor sleeve is arranged on the cover plate sleeve frame, and a limitation groove corresponding to the limitation bulge is arranged on the cover plate sleeve frame, an electric motor conductive contact sleeve insulated from the electric motor is arranged on a surface of an electric motor reducer, wherein the electric motor conductive contact sleeve comprises an inner layer insulation sleeve and an outer layer conductive layer, wherein the inner layer insulation sleeve covers the surface of the electric motor reducer, the outer layer conductive layer is sleeved on the inner layer insulation sleeve, the outer layer conductive layer is electrically connected to one power supply connection point of the electric motor, the other power supply connection point of the electric motor is electrically connected to the electric motor housing, and a power supply elastic sheet is arranged at one side, close to the outer layer conductive layer, of a bottom of the lock plug body, the power supply elastic sheet being in elastic contact with outer layer conductive layer, and the electric motor housing is electrically connected to the electric motor output shaft through an internally connected mechanical gear, the electric motor output shaft and the lock plug core are electrically interconnected as well, the lock plug core and lock plug case are further electrically interconnected, such that the power supply connection point connected to the electric motor housing is caused to be electrically interconnected through the mechanical gear, the electric motor output shaft, the lock plug core and the lock plug case.