The invention relates to an electrical push rod type electrical power-assisted steering device, which comprises a recirculating ball steering gear provided with a torque sensing device, an electrical push rod and an electronic control unit, wherein the torque sensing device is used for detecting moment acted on a steering wheel, and is arranged on an input shaft of the recirculating ball steering gear. One end of the electrical push rod is connected with a steering rock arm, and the other end of the electrical push rod is connected with a vehicle frame. The electrical push rod comprises a power-assisted motor and a speed reducing mechanism, a push rod and so on. An input shaft of the speed reducing mechanism of the power-assisted motor is connected with an output shaft of the power-assisted motor, an output shaft of the speed reducing mechanism is connected with a screw rod of the push rod, and the moment output by the power-assisted motor pushes a rock arm shaft to rotate through a screw nut transmission pair. The electronic control unit is used for controlling the current of the power-assisted motor according to signals of the torque of the steering wheel and the vehicle speed and so on. The steering device can save energy, provide proper power assistance under various running work conditions, has fewer parts, light weight, compact structure and high assembly automatic degree, and is a steering mechanism of vehicle power with energy conservation, safety and environmental protection.