Abstract: According to the principle of high-frequency sound waves produced by hydraulic supports leakage, hydraulic leakage detection system is developed. The system can receive high frequency sound waves to detect and locate leakage. The practice of the detector shows that the false alarm probability of hydraulic leakage detection system is relatively low, it can not only detect internal leakage problem of support, but also determine the leak location. Through the leakage nondestructive testing, it improves the management level in hydraulic support, at the same time, also improves the accuracy of support and roof surrounding rock measurements.