Gas tightness detection device for gas calibration valve

The utility model relates to the technical field of valve airtightness detection devices, in particular to a gas calibration valve airtightness detection device which comprises a base and a gas pipe, a pressure gauge, a first valve and a second valve are fixedly installed on the side wall of the base respectively, an installation plate is installed at the upper end of the base through a supporting column, and a cylinder is fixedly installed at the upper end of the installation plate. The output end of the air cylinder penetrates through the mounting plate and is fixedly provided with a pressing block; if the pointer on the pressure gauge slowly descends, it is indicated that the gas calibration valve is good in gas tightness in the closed state in the opening and closing function, and if the pointer on the pressure gauge slowly descends, it is indicated that the gas calibration valve is poor in gas tightness or closing performance in the closed state in the opening and closing function; if the product index r