A preparation method of hairy crab feed, which is composed of: white fish meal, snail meat meal, clam meat meal, peanut kernel cake meal, herring meal, small kelp meal, agricultural shrimp meal, sweet corn meal, soybean protein meal, and bone meal. The stated percentages are percentages by weight; the above-mentioned hairy crab feed is low in cost and fast in growth, and has a good effect on feeding young crabs and adult crabs. The crabs raised are generally fat, and the disease rate of crabs is low. It overcomes the disadvantages that hairy crabs are slow to grow, small in size, light in weight, less active, poor in palatability and susceptible to various diseases due to various nutritional deficiencies in the existing feed.