Abstract: This paper introduces the basic principles of mine transient electromagnetic method, apparent resistivity formula of mine transient electromagnetic method. Using mine transient electromagnetic multi-directional cross-probing technology in the limited space of the coal mine roadway, data collection is completed. Preprocessing multi-directional cross-probing the raw datum time-depth conversion, through a comprehensive analysis of the detect effect of four points on the collapsed column, the electrical characteristics of collapse column, the location, depth and range of geological roadway excavation.