The invention relates to a set pressure measuring system and a method for pressure sensing control valves. The set pressure measuring system comprises a fluid pressure source, a stop valve, a throttle orifice plate, a pressure sensor and an acquisition system. An outlet of the fluid pressure source is connected with the stop valve, the stop valve controls the throttle orifice plate to lead fluid to be injected into a control cavity of the pressure sensing control valve, and the pressure sensor is arranged in the control cavity, and the acquisition system acquires pressure data of the pressure sensor. The set pressure measuring system and the method for pressure sensing control valves solve the technical problems that existing set pressure measuring methods for existing pressure sensing control valves are high in affection of human factors and high in measurement error, can realize accurate measurement of set pressure of the pressure sensing control valves and removes error caused when readings of pressure gauges are read manually, and accordingly measurement precision can be improved greatly.