In order to solve the problem of water leakage of the pig's water nozzle, ensure the product quality and improve the work efficiency, an automatic detection device for the sealing of the pig's water nozzle is designed to automatically detect the sealing of the pig's water nozzle. The device includes a water tank bracket, a detection device and a control system, which can adjust the pig's water nozzle of different sizes to be tested, and realize the simultaneous adjustment of different types of products At the same time, water pump and water tank can be used to achieve the recycling of test water, low consumption and environmental protection.The test results show that the equipment is used to test the sealing performance of pig drinking nozzle, and the qualified rate reaches 98%. A single equipment can improve the production efficiency by about 600%, reduce the labor cost by more than 300%, greatly improve the production efficiency and reduce the labor intensity. The research can provide reference for the design of various leak detection equipment.