The low-concentration cyanide-containing wastewater in a mine is deprived of cyanide with 3 methods:CG101 efficient reagent cyanide removal method,hydrogen peroxide oxidation method,ferrous sulfate precipitation method.With the same reagent dosage,CG101 efficient reagent cyanide removal method performs the best.The test conditions are optimized and the industrial application is finally realized.The results of engineering application show that CG101 efficient reagent cyanide removal method runs stably,and the mass concentration of total cyanide compound after treatment meets Grade Ⅱ standard limit value according to GB 3838—2002 Environmental Quality Standards for Surface Water.