On-line automatic detection device for pipe network leakage

The invention discloses an on-line automatic test device for pipe network leakage and belongs to the technical field of detection of the pipe network leakage. The on-line automatic detection device comprises a water meter; and a sound sensor, a sound signal acquirement circuit, a time control device, a signal processing circuit, a comparison circuit, a communication module and a power supply are arranged in the water meter. Compared with the prior art, the on-line automatic detection device regularly and automatically collects and processes sound information in the pipe network through the sound sensor installed in the water meter and judges whether the pipe network has leakage after comparing with the standard frequency spectrum; due to automatic detection, the device is time-saving and labor-saving; moreover, the phenomenon that detection result and detection standard are inconsistent because manual detection of leakage depends on personal experience is avoided; and a detection result provided by the detection device has characteristics of objectivity and accuracy.