Method and system for checking air tightness of nozzle block

The invention provides a nozzle block airtightness leakage detection method and system, and relates to the field of gas metering. The method comprises the following steps: when a detection signal for indicating the start of meter detection is obtained, controlling each leakage detection needle valve and a corresponding cylinder valve to act, so as to obtain initial leakage detection pressure meter information for indicating the fluctuation condition of a pressure value after the air pressure of each leakage detection gas path is released to a first target pressure, and when the initial leakage detection pressure meter information indicates that the pressure value is continuously reduced, starting the leakage detection. The air cylinder valves are subjected to leak detection to obtain the leaked air cylinder valves, and through leak detection of the air cylinder valves, automatic detection of the sealing performance of the nozzles is realized, and compared with manual detection, the efficiency and the accuracy