Test method and test apparatus for sealing performance of rubber gasket

The invention discloses a test method and test apparatus for sealing performance of a rubber gasket. The test apparatus comprises a cap-shaped housing, a bottom cover plate and a pressure device, wherein a joint at the top portion of the housing communicates with the pressure device through a pipeline, the bottom of the housing is provided with an annular-shaped flange, the flange is adapted to a rubber gasket to be tested, and the bottom cover plate is a circular plate which can cover the flange of the housing; the rubber gasket to be tested is in clamping connection between the housing flange and the bottom cover plate and is fixed by use of fasteners, the joint on the top portion of the housing communicates with the pressure device, and a sealing chamber is formed in the inner cavity of the housing; and when an air tightness test is carried out, the bottom of the housing is placed in water, when an oil tightness test is carried out, a test liquid oil is injected into the housing through the joint at the to