In the vein of modern cities, the underground water supply network is like the lifeline of the city, silently supporting the daily water needs of thousands of households. However, with the growth of service life and changes in the geological environment, water leakage caused by aging and damage of water pipes is becoming more and more prominent, which not only causes the waste of valuable water resources, but also may lead to safety hazards such as ground subsidence. In the face of this challenge, efficient and accurate water leakage detection technology is particularly important. In this context, PQWT leak detector has become a leader in the field of underground water supply pipe leakage detection with its excellent performance and innovative technology.