The invention discloses a pig feed for promoting digestion and absorption. The pig feed comprises the following raw materials: corn flour, wheat bran, rice bran, soybean meal, sugar slag, multivitamins, tea saponin, vinasse yeast culture, chitosan oligosaccharide, mannan oligosaccharide, gunk and Chinese medicine composition. The invention also discloses a preparation method of the pig feed for promoting the digestion and absorption. By adding the vinasse yeast culture which is rich in nutrition and is capable of being used in combination with the chitosan oligosaccharide and the mannan oligosaccharide after mixed, the pig feed prepared by the invention obviously improves the intestinal function and promotes the immunity; by adding the vitamins, the immunity of live pigs is increased, thelive pigs are kept to healthily grow, and the use of antibiotics used for treatment is obviously reduced; and by adding the tea saponin and the Chinese medicine composition, the gastric function is prompted, the digestive ability of the pigs is improved, the growth speed of the pigs is boosted, the immunity of the live pigs is further strengthened, and the pig feed has broad market prospect.