Abstract: Aiming at the technical problems of controlling No.6 water inflow point of Ordovician limestone in Sangshuping Coal Mine in the past 40 years, through the analysis of hydrogeological survey, the reinforcement and water diversion technology of water retaining wall and surrounding rock loose ring is studied, the treatment scheme and construction measures are optimized, and repeated grouting tests and technical innovations are made on cracks around water retaining wall and pipeline interface. Rock cracks and pipeline leaking water were thoroughly treated, water plugging rate reached 99.1%, energy saving and emission reduction effect is very significant, which effectively improves the mine flood resistance.