The invention provides a method for detecting non-digging deep-burried pipeline, which is a long and straight electro-magnetic wave non-digging deep-burried pipeline detecting method using electro-magnetic wave generated by long wire as an work medium, that is long wire detecting method. By the method, non-digging metal pipeline deeper than 5m can be detected by earthing distant end of wire from 50m to 150m and selecting suitable frequency and electric current, thereby exactly providing horizontal location and buried depth space data of the underground pipeline, making sure safety operation and management of the crossing pipe segment, and providing reliable guaranty for data accuracy of pipeline information system.