Abstract: In order to solve the problems in the injection of H₂S absorption solution in the coal seam and the addition of the absorption solution, in this paper, west B₁₊₂ fully mechanized caving face on +475 m level in a coal mine in Xinjiang Region was taken as the research object, research was made on the technological parameters of water injection in coal seams, and examination was focused on the influence factors of H₂S absorption efficiency and its laws by adding H₂S compound absorbent. The experimental results showed that the suitable conditions were 6 MPa of water injection pressure, 0.3% of the added wetting agent concentration and 1.0% of the absorbing solution concentration. Under such conditions, H₂S absorption efficiency at the driver position of the shearer and in the support sidewalk was respectively 65.1% and 71.4%, and the H₂S absorption efficiency at the coal caving position reached 56.3%. The test results can be used as the reference basis for the treatment of H₂S and the study of its process parameters in coal mines.