The invention relates to a beneficiation method for high-grade copper-nickel sulphide ore, and belongs to the field of beneficiation methods for copper-nickel sulphide ore. The beneficiation method includes the steps of 1), crushing and screening of raw ore, 2), magnetic separation and preconcentration of the raw ore, 3), grinding separation of low-grade ore, 4), reselection of tailings and 5), flotation of concentrates, concentration and filtration. During floatation, a beneficiation reagent in a specified ratio is added step by step, and high-grade copper-nickel ore of 2.5-5% is processed based on the technological process of low-grade copper-nickel ore of 0.5-1.5%. On the condition of 3.88% nickel grade and 0.56% copper grade of the raw ore, copper-nickel bulk concentrates with comprehensive nickel grade of more than 6% and comprehensive nickel metal recovery rate of 95% are acquired. The method is reliable and advanced in technology, low in investment, high in benefit and high in comprehensive recovery rate of valuable metal, and is an ideal beneficiation method for processing high-grade copper sulphide ore, nickel sulphide ore and copper-nickel sulphide associated ore by the original technological process.