The invention provides a compound feed for red cream crabs and a preparation method thereof, and the compound feed for the red cream crabs can be used for solving the problems that the red cream crabs cultured traditionally are slower in growth, not full in cream and the like. The formula of the compound feed comprises the following raw materials in percentage by weight: 18-25% of flour, 1-5% of fish meal, 5-20% of soybean meal, 10-20% of rapeseed meal, 5-15% of cottonseed meal, 1-5% of shrimp shell powder, 1-6% of squid liver paste, 1-6% of corn, 1-6% of corn protein powder, 5-14% of corn plantule cake, 1-3% of stone dust, 1-3% of fish oil, 2-7% of soybean lecithin powder, 0.5-2% of calcium dihydrogen phosphate, 0.1-0.5% of common salt, 0.1-0.4% of choline chloride, 0.01-0.02% of antioxidant, 0.04-0.09% of antifungal agent, 0.01-0.03% of bile acid, 0.1-0.3% of multiple vitamins for the crabs, 0.1-0.30% of multiple minerals for the crabs, 0.03-0.06% of vitamin E, 0.03-0.09% of 35% vitamin C phosphate ester and 0.006-0.009% of astaxanthin. The preparation method comprises the following steps: performing ultra-micro pulverization on all the raw materials, enabling 95% of the raw materials to pass an 80-mesh standard sieve, pelletizing at the temperature of 105 DEG C and simultaneously curing for 45 minutes after heat preservation. The compound feed for the red cream crabs, provided by the invention, can meet the nutritional demands for fattening the cream crabs, simultaneously enable crab roe to be red in color and bring higher farming income to farmers.