In order to improve the core recovery and the quality in complex soft strata to compensate the functions of common double-pipe drilling tools, 91 single-action triple coupling pipe drilling tool was particularly developed. This paper introduces the drilling tool about its structure, working principle, assembly, maintenance and the field application in 5 boreholes of 3 different mining areas. The application results show that this drilling tool is suitable for loose formation drilling with core recovery up to 100% and with no core disturbance. The cores are kept being undisturbed, the improved cores quality is benefited for post transportation and storage.