The invention discloses a beneficiation method for efficiently separating copper, nickel and cobalt from cobalt-rich low-nickel sulfur. The beneficiation method comprises the following steps: milling95-97% of cobalt-rich low-nickel sulfur to the granularity of -53 [mu]m by a rod mill, adding alkaline water in an ore milling process to control the pH value to be 12.5-12.6, and controlling the oremilling concentration to be 66-70%; adding 0.110-0.120 kg of a collecting agent S11016 into each ton of the milled cobalt-rich low-nickel sulfur; and performing flotation by a primary roughing, five-times refining and secondary scavenging beneficiation process to obtain a copper concentrate and a nickel and cobalt concentrate. The obtained copper concentrate contains more than 58% of copper and less than 5% of nickel. The nickel and cobalt concentrate contains less than 8% of copper, more than 95% of cobalt recovery rate and less than 13% of copper and nickel. The copper concentrate can entera copper smelting process. The nickel and cobalt concentrate enters a wet leaching process. The problems that a wet copper removal process is high in cost and does not facilitate reclamation of cobaltare solved. The beneficiation method has the advantages that the process is simple, less beneficiation equipment is provided, the operation and the maintenance are easy, the types of medicals are less and easy to adjust and control, and the running cost is low.