Abstract: During the production period, the concentration of hydrogen sulfide in the excavation face of the transportation roadway in the third mining area of Shenghui Coal Industry is high, which seriously affected the physical and mental health of the workers. The concentration of hydrogen sulfide is measured on site, and the characteristics of hydrogen sulfide migration in the coal bodies of different cutting areas and in three directions are obtained. Combined with the diffusion characteristics of hydrogen sulfide, a high-pressure external spray foam absorption liquid system is developed and designed, and the core key components are designed. The treatment effect of hydrogen sulfide by spraying different concentrations of foam agent and absorbent is analyzed. Based on the on-site operation conditions and treatment costs, the most reasonable concentrations of the foam agent and the absorption liquid in the excavation face of the transportation roadway in the third mining area of Shenghui Coal Industry are finally determined to be 3% and 0.5% respectively. After implementing the treatment of hydrogen sulfide with high-pressure external spray foam absorption liquid, it is found that the concentration of hydrogen sulfide at the driver of the roadheader decreases from 122×10⁻⁶ to 6×10⁻⁶, and the absorption efficiency reaches 95.08%. The concentration of hydrogen sulfide at 10 meters downwind decreases from 102×10⁻⁶ to 5×10⁻⁶, and the absorption efficiency reaches 95.10%.