Gasket high and low temperature sealing performance test device

The utility model relates to a gasket high and low temperature sealing performance testing device, and belongs to the related technical field of sealing performance testing devices. Comprising an upper neck flange, a sealing flange, a lower neck flange, a helium tank, a thermocouple and a helium mass spectrometer, the upper neck flange and the lower neck flange are connected in a sealed mode through a fastener to form a sealed space. The upper neck flange is connected with the sealing flange in a sealing manner through a fastener; a test sample gasket is arranged between the upper neck flange and the sealing flange; helium in the helium bottle is injected into the upper neck flange through a pipeline to form a high-pressure space; the thermocouple is connected into the high-pressure space and is used for monitoring the test sample gasket; the helium mass spectrometer is connected with a sealed space formed by the upper neck flange and the lower neck flange; the upper neck flange and the lower neck flange are