The invention relates to a feed additive of black carps. The feed additive is characterized by being prepared from the following raw materials in parts by weight: 3-6 parts of zinc lactate, 10-14 parts of calcium citrate, 5-8 parts of methionine, 8-12 parts of taurine, 3-6 parts of citric acid, 3-6 parts of folic acid, 2-5 parts of L-arginine, 6-10 parts of sodium diacetate, 3-6 parts of organic selenium, 8-12 parts of choline chloride, 1-3 parts of ferrous sulfate, 2-4 parts of copper sulfate, 2-4 parts of sodium chloride, 3-6 parts of pyridoxamine, 2-5 parts of vitamin A, 2-5 parts of vitamin C, 3-5 parts of vitamin D, 1-3 parts of vitamin E, 3-6 parts of inositol, 2-4 parts of yeast beta-glucan and 5-8 parts of wheat oligopeptides. The feed additive of the black carps, provided by the invention, can be used for improving the nutrient balance of fishes very well; and the immunity is easily enhanced and the growth and the development are facilitated.