The invention relates to the field of automatic control for a pump station and particularly relates to a feedback control system of a water supply pump station with in-series same pumps. The whole feedback control system comprises programmable-logic-controller control parts with different functions, wherein a liquid-level feedback control part of a reservoir controls the openness of an outlet valve of the pump station; a pump-valve torque feedback control part controls motor-rotation torques of the pumps; a pump-pump rotating-speed control part maintains the consistent pump rotation speed of the in-series pumps; and an openness feedback control part of a safety control valve controls the instantaneous excessive water outflow of the reservoir. The feedback control system has the advantages that an automatic control system with independence and perfect functions is established, the function of integration of detection and control is realized, and the management level and operating efficiency of the water supply pump station can be improved.