The invention discloses a Hongze lake steamed crab feed and a preparation method thereof. The feed is composed of the following components according to mass percent: 31.00% of wheat, 15.00% of bean pulp, 10.00% of fresh dried fish, 10.00% of cotton seed meal, 8.00% of rice bran, 8.00% of rapeseed meal, 5.70% of spiral shell meat, 3.00% of corn protein powder, 2.00% of shrimp meal, 1.60% of squid meal, 1.00% of soybean oil, 1.00% of zeolite powder, 1.00% of phosphoric acid single calcium, 1.00 %of phospholipid oil, 0.25% of choline, 0.05% of salt, 1.00% of premix compound, 0.40% of Chinese medicinal herb additive, thus 100% in total. According to the physiological characteristics, life habit and natural law of the Hongze lake steamed crab, the invention achieves high yield of the Hongze lake steamed crab under large-scale artificial culturing by optimizing feed components, adding Chinese medicinal herb in the feed and changing the traditional processing method of crab feed; and the Hongze lake steamed crab has the natural characteristics of large size, haleness, puffy crab cream, natural and fresh taste, high nutrient value and the like.