The invention provides fodder for relieving constipation of a pregnant sow. The fodder comprises, by weight, 45-50 parts of corn, 6-8 parts of bean pulp, 5-15 parts of wheat bran, 2-5 parts of corn wine dross, 8-13 parts of wheat flour, 0.5-2 parts of fatty powder, 5-15 parts of sugarbeet grain pulp, 5-12 parts of rice bran pulp, 0.1-1 part of decavitamin, 0.1-1 part of mineral elements, 0.01-0.5 part of microecologics, 0.01-0.1 part of prebiotics, 0.01-1 part of complex enzyme, 0.1-2 parts of functional puffing fibers, 0.1-2 parts of functional mineral salt, 0.1-0.5 part of lysine sulfate, 0.05-0.2 part of threonine, 0.05-0.2 part of methionine, 0.05-0.2 part of choline chloride, 0.05-1 part of baking soda, 0.1-1 part of salt, 0.5-2 parts of calcium carbonate and 0.5-2 parts of calcium monohydrogenphosphate. According to the fodder provided by the invention, various additive ingredients are scientific in cooperation and reasonable in dosage, and the farrowing rate of the sow is effectively increased by 0.5 piglet per birth on average; and the treatment and medicine cost is reduced by 20 yuan per sow, and economic benefits are increased.