GM refrigerating machine gas volume testing device and measuring method thereof

The invention discloses a GM refrigerating machine gas flow testing device and a measuring method thereof.The testing device comprises a first mass flow meter, a second mass flow meter, a first flow displayer, a second flow displayer and an upper computer, wherein the first mass flow meter and the second mass flow meter are arranged at a cold head gas inlet and return port of a GM refrigerating machine; the first flow display instrument is electrically connected with the first mass flow meter, the second flow display instrument is electrically connected with the second mass flow meter, and the upper computer is electrically connected with the first flow display instrument and the second flow display instrument. The upper computer converts the instantaneous air inlet flow value measured by the first mass flow meter into the average air inlet flow per hour through integral operation, and converts the instantaneous air return flow value measured by the second mass flow meter into the average air return flow per