Abstract: In the article, hole-roadway transient electromagnetic apparatus for coal mine is designed. Compared with the traditional mine transient electromagnetic instrument, the device greatly improves the detection accuracy. Using the way of underground tunnel transmitting and receiving drilling, the shielding effect of the borehole layer can greatly reduce the external interference of the working face during receiving the signal and improve detection accuracy, to ensure safe and efficient mining. This paper introduces the detection applications of mine-used hole- roadway transient electromagnetic system in this area, mainly introduces the working principle of the whole system, and the test case, and the test results show that it can more accurately reflect the geological abnormal position.