The invention relates to the technical field of oil recovery engineering, and in particular to a brushless motor energy feedback speed control system for a pumping unit. The system solves the problemthat the "reverse power generation" generated during the operation of the pumping unit cannot be fully utilized and the running energy consumption increases. The system consists of a public power grid(1), a power input control unit (2), a brushless motor (3), a speed sensor (4), a power output control unit (5), an embedded controller (6), a screen display control unit (7) and an energy feedback unit (8). The system adopts embedded digital control technology to automatically regulate and optimize the operating speed of the pumping unit and completely absorbs the reserve power generation energyduring the operation of the pumping unit. The system has the advantages of strong pertinence, safety, energy conservation, reliability and practicality.