The water inspection workbench is used for water leakage detection of automobile air conditioning pipe assembly pipeline or similar products. 4-6 air conditioning pipe assemblies can be clamped at one time. The lifting cylinder adopts double acting cylinder, with throttle and magnetic switch. The lifting speed is adjustable and the operation is stable. PLC control is adopted, and the pressure holding time of nitrogen filling or dry high-pressure gas is controlled, accurate to 0.1s and the time is adjustable. The control process: install the pipe fittings → press the start button → lower the working part → open the inflation to the pressure → delay (settable) → discharge and pressure relief → rise the working part. It is one of the necessary equipment for pipe fittings factory.