Wave detection at the 2-201 working face of Tenghui Coal Industry Corporation Ltd. of Huozhou Coal and Power Group was taken as an example, the research and application of the trough wave reflection detection technology at the coal mine structure interface was carried out. The use of this technology accurately and effectively solved the problem of detecting the fault location on the side of the roadway, providing a basis for mining production departments to carry out mining arrangements, reducing invalid footage, improving resource recovery and losses. It had certain guiding significance for the geophysical prospecting of complex mines.