Aiming at research and development of highlevel gasliquid pressurized cylinder, taking the selfdeveloped gasliquid pressurized cylinder as an example, combined with the gasliquid pressurized principle and NI data acquisition card and LabVIEW software, an integrated testing system for the gasliquid pressurized cylinder was designed. The error between the test results and the theoretical value is within 5%. The calculated uncertainty shows that the reliability of the test results. The life test method for the testing system was put forward.