A scissors fork type extended-range pumping unit comprises a motor, a motor supporting base, a speed reducer, a crank, a rocker, an installing support, a scissors fork supporting arm hinged shoe, an upper supporting platform, a horsehead hinged shoe, a horsehead, a scissors fork type lifting mechanism, a hydraulic device, a polished rod lifting rope, a lower supporting platform and a supporting base. Structures of a double-action wheel type pumping unit and a pedal single-arm walking beam extended-range pumping unit are used for reference, a range extending device is improved by adopting the scissors fork type lifting mechanism, and the stroke of the pumping unit is effectively lengthened by using the characteristics of providing enough lifting height and saving space of the scissors fork type lifting mechanism. The characteristics that the scissors fork type mechanism bears heavy loads and moves stably are used, and the mechanism moves more smoothly, and the oil pumping efficiency is improved. Different performance requirements of pumping units in large, medium and small sizes can be met by changing the structure of the scissors fork type lifting mechanism.