The invention belongs to the technical field of mariculture, and in particular relates to a formula feed for breeding portunus trituberculatus The formula feed for breeding portunus trituberculatus comprises the following components by weight percent: 25-28 percent of wheat flour, 9-12 percent of corn DDGS (distillers dried grains with soluble), 15-18 percent of fly larvae powder, 12-14 percent of protein powder, 3-5 percent of saccharomyces cerevisiae, 1-2 percent of DHA (docosahexaenoic acid), 1 percent of EPA (timnodonic acid) refined oil, 2 percent of fish oil, 1 percent of kelp powder, 0.1-0.2 percent of choline chloride, 0.2 percent of sodium chloride, 0.04-0.05 percent of L-carnitine, 2-4 percent of isomaltooligosacharide, 0.3 percent of composite bacillus, 0.05-0.06 percent of antimildew agent, 1-3 percent of compound binder, 1-2 percent of composite mineral substance, 0.5-1.5 percent of composite vitamin and the balance of biogas residue. In the formula feed provided by the invention, a plurality of components are effectively mixed, and use of fish meal and soybean meal is avoided, therefore, the influence of anti-nutritional factors in the soybean meal on the growth of portunus trituberculatus is reduced. The formula feed has the advantages of reasonable formula, sufficient material source and rich nutrient of material components. The recycling use ratio is greatly improved, and the survival rate and weight gain rate of portunus trituberculatus are significantly improved.