Detection method for health situation of underground pipe network

The invention discloses a detection method for health situation of an underground pipe network. The detection method includes the steps of: 1) performing pipeline positioning with a ground penetrating radar to obtain a pipeline route location map of the to-be-detected pipe network; 2) enabling a detection vehicle to move along the pipeline route location map at constant speed so as to magnetize the to-be-detected pipe network by means of a magnetizer arranged on the bottom of the detection vehicle, wherein the detection vehicle is provided with the magnetizer, a magnet sensor, and a GPS apparatus; 3) collecting signals of magnetic lines by means of the magnet sensor in real time, and sending the signals to a signal processing module for processing the signals; 4) determining a processing result; 5) synchronously recording the detection signal and GPS information to obtain information of position of abnormal points on the pipeline, and marking the abnormal points on the pipeline route location map. The method is based on magnetic flux detection, wherein the position and degree of defects on the underground pipe network are accurately determined according to the result of the magnetic field detection signal, so that the method is more accurate and has intuitive result, and has advantage on long-term maintenance of the underground pipe network.