Vacuum sealing tester

The utility model relates to a vacuum sealing tester which comprises a main machine and a vacuum chamber, the main machine comprises a control panel, a vacuum pump and a vacuum meter, and the vacuum chamber comprises a vacuum container used for loading test liquid and a sample, a sealing cover used for sealing the vacuum container and a positioning assembly used for fixing the sample in the test liquid in the vacuum chamber; the sealing cover is provided with a connector connected with a vacuum tube, the positioning assembly comprises a sleeve, a first spring, a moving rod and a pressing plate, the sleeve is fixed to the sealing cover, the first spring is arranged in the sleeve, the moving rod and the sleeve are connected through the first spring to form a telescopic structure, and the pressing plate is fixed to the moving rod. And a plurality of uniformly distributed air holes are formed in the pressing plate. According to the utility model, the positioning assembly with a special structural design is adopte