With the widespread application of piston pressure gauges, traditional pressure measurement devices are unable to meet the demands of modern industrial and technological development for high precision, high stability, and low cost, etc. To address these challenges, a new type of pressure standardizer, the absolute pressure gas piston pressure gauge, has been developed. The design parameters of the pressure gauge are as follows： measurement range of 6 kPa to 7.5 MPa, minimum resolution of 2 kPa, and accuracy grade as high as 0.005. The pressure gauge features efficient loading of weights and pollution-free. Test results indicate that the pressure gauge exhibits stable performance and high accuracy, enabling precise measurement and calibration of gauge pressure, absolute pressure, and vacuum pressure. The design has enhanced China's high-precision pressure measurement technology capabilities, and provided a crucial technical support for the development of related industries. The design holds significant importance for promoting national defense construction and industrial technological progress.