The utility model relates to a pressure calibration technology field, in particular to pressure relief valve calbiration system. Including pressure relief valve, wherein air compressor loops through air water filtration ware, electronic pressure regulating valve, high accuracy pressure sensor, solenoid valve and is connected with compression test jar management way, the one end of compression test jar is connected with the silencer through the bleed valve, the other end of compression test jar is connected with pressure relief valve, singlechip controller's one end is connected with electronic pressure regulating valve through solid state relay, singlechip controller's the other end is connected with the solenoid valve through the relay. The utility model has the characteristics of measuring range is wide, the measuring accuracy is high, and what the reliability was high is showing, can be to the pressure relief valve calibration of automizing.