The die-casting part sealing test bench employs a dual-judgment approach, utilizing both hydraulic leak detection and pneumatic pressure drop testing. It is suitable for sealing inspection of high-precision castings, materials, and other products. The water-air hybrid sealing pressure tester is designed for air tightness testing and pressure sealing tests on high-precision, high-pressure components and complete machines. It is primarily used to inspect product sealing and pressure resistance damage. Through PLC control and pressure monitoring, the tester utilizes both water injection and air inflation methods to supply water and air at constant pressure to the product. PLC settings include water injection time, air inflation time, pressure limits, holding time, and equalization time. During testing, the PLC automatically determines whether the test result is OK or NG based on the test outcomes. The system is easy to operate, utilizes imported and well-known domestic components, and operates stably and reliably