Abstract: The structural detection of coal face is an important guarantee to realize safe and efficient mining of coal face. Taking the structural detection of working face 12404 in Wulanmulun Coal Mine as the research background, the in-seam seismic exploration technology was applied to optimize the exploration process parameters. Through the arrangement of excitation points and detection points along the main transport lane, return air lane and cut hole, a total of 249 receiving points and measuring line length of 2,480 m were set up. A distance of 20 m was used to arrange 129 excitation points. The full array acquisition scheme was adopted to receive the effective data, and the 129 guns were used to collect the effective data. All the verified data met the requirements. Using the method of combined transmission slot wave and reflection slot wave, data processing and interpretation, it is concluded that there are 4 faults in the panel, and there are no other geological anomalies. By further analysis, the strike, drop, length and degree of control of the four faults were obtained.