The invention discloses compound feed for improving the estrus rate of s Sanyuan replacement gilt. The compound feed comprises the following ingredients in parts by weight: 55-65 parts of corns, 7-10parts of soybean meal, 10-15 parts of fiber compounds, 1-2 parts of soybean oils, 1-2 parts of corn starches, 0.5-1 part of table salt, 1-2 parts of mountain flour, 1-2 parts of c calcium hydrogen phosphate, 0.3-0.5 part of lysine, 0.4-0.8 part of threonine, 1-2 parts of Chinese herbal medicine fermentation products, 0.1 part of choline chloride, 0.02 part of antioxidant, 0.05 part of mildew-proofagent and 3-4 parts of gilt compound premix materials. In the compound feed disclosed by the invention, key raw materials are subjected to fermentation and enzymolysis, nutrition is comprehensive, and the normal growth of the reproductive system of the Sanyuan replacement gilt can be guaranteed. Since the corn flour and the soybean oils are added, a ratio of energy from the starch and fat in feedenergy can be guaranteed, and triglyceride and total cholesterol concentrations in gilt blood can be improved so as to be favorable for puberty startup. Since a fiber compound is used for replacing bran, the secretion of insulin is accelerated so as to be favorable for the sex hormone secretion of the replacement gilt, the replacement gilt is accelerated to enter the estrus, the intestinal floraof the replacement gilt can be regulated, and the intestinal health of the replacement gilt can be maintained.