Abstract: The SO2 gas generated in the combustion process has a great impact on the environment and seriously endangers the human living environment. Therefore, in order to remove sulphur, this paper proposes to use coal seam water injection technology to remove sulphur from the source. The principle and influencing factors of sulfur released from coal mining source have been studied in laboratory. The results show that: adding chelating agent to coal seam water injection can release mineral sulfur effectively and increase water injection effect to coal seam after IDS action; soaking time has little effect on the amount of Fe ion leaching, while the concentration of IDS and the temperature of the environment have great influence on the amount of Fe ion leaching, and the amount of ion leaching with small solid-liquid ratio is larger. Ion leaching with high solid-liquid ratio is smaller.