This airtightness testing machine can complete the manual feeding and card positioning of the gas storage cylinder to be tested. The tested product undergoes manual/automatic clamping, inflation, water filling, pressure holding time, rotation, manual foot pedal forward and reverse observation, and the leakage part of the non-conforming product is manually marked. After the test is completed, manual/automatic stop, deflation, drainage, and release are carried out to achieve the entire testing task