The invention provides a high-efficiency corrosion-retarding detergent for cobalt-base alloy. The invention belongs to the field of detergents and especially relates to a detergent for cobalt-base alloy. The concentrated solution of the high-efficiency corrosion-retarding detergent for cobalt-base alloy provided in the invention comprise the following components on a mass basis: 3.7 to 7.4% of a composite nonionic surfactant, 0.6 to 1.2% of a composite borax corrosion inhibitor, 0.4 to 0.8% of an ethanol cosolvent, 0.5 to 1% of an ethylene diamine tetraacetic acid water softener and 0.2 to 0.4% of a silicone polyether anti-foaming agent, with the balance being water. The concentrated solution and water are mixed according to a mass ratio of 1:9 to prepare a working solution. The surfactant of the detergent is a high-efficiency environment-friendly alkalescence detergent compounded by three surfactants and is used with the composite borax corrosion inhibitor according to a scientific mixing rate. The high-efficiency corrosion-retarding detergent has the advantages of low content of organic matters, high cleaning efficiency and a good corrosion-retarding effect, and especially enables the problem of precipitation of cobalt from cobalt-base alloy due to utilization of normal metal detergents to be overcome, loss of cobalt in the alloy structure resulting from cleaning of cobalt-base alloy to be avoided and the quality of the cleaned products to be guaranteed.