The equipment is mainly used for automobile and motorcycle parts industry product assembly and shell cavity sealing detection. The test system adopts man-machine interface system; customized high-performance PLC; high-precision IO data acquisition module; Yadeke and SMC pneumatic components; parameter modular combination and call; automatic sealing and sealing of workpiece cavity; intelligent judgment of product air tightness by standard differential pressure test unit Leakage; through high-precision micro differential pressure test unit; intelligent judgment of product air tightness leakage (optional); test results and data are stored through man-machine interface to facilitate customer analysis of product quality; improve the follow-up traceability of products. It can replace the old-fashioned water test method, avoid the adverse factors caused by the old direct water test method, reduce the process of wiping after the water test; the operation of the fixture is simple and the replacement is convenient; the labor intensity is reduced, and the production efficiency and product quality are greatly improved; the equipment meets the CE standard and environmental protection requirements.