Abstract: The prevention and control of river oil pollution has become the focus of social attention. The discharge of oil leakage from hydropower stations is one of the causes of pollution. In view of the problems existing in the hydropower stations and the shortcomings of the existing treatment methods in the oil pollution absorption link, a new set of oil pollution control device for leakage water-collecting well of hydropower station combining software and hardware is designed and developed. Semi-floating dynamic balance overflow floating oil suction tank is adopted to adapt to the thickness change of the floating oil layer, so as to prevent excessive suction of water leakage. The rear design of the pump can avoid oil emulsification caused by mixing oil, which is also conducive to oil-water separation. The device has been successfully applied to Hubei Xinglong Water Control Project to solve the problem of oil leakage control.