Double-horsehead pump jack is an energy-saving product that has a long stroke and low SPM. It is used for pumping oil of middle and high viscosity and high water content. Compared with the regular conventional beam pump jack,it has longer stroke length, smaller dynamic loads and variation of the torque, higher efficiency, lower energy consumption, smoother operation, and easier start. A multi-purpose electric cabinet is incorporated in the jack which has the functions of short circuit protection, overload or underload protection, offset without work, automatic start after power resuming, over speed control of the motor. Compared with the conventional beam pump jack, it increases the stroke length by 70%, reduces energy consumption by 20-30% and decreases unit installed capacity by 50%.