The invention provides a pig feed used for reducing pig dung stink, and a preparation method thereof, and belongs to the technical field of pig feed. The pig feed is mainly prepared from following raw materials, by weight, 60 to 80 parts of bean dregs, 20 to 25 parts of cassava dregs, 40 to 60 parts of puffed corn flour, 8 to 15 parts of shrimp meal, 2 to 3 parts of citric acid, 5 to 8 parts of vitamin, 30 to 40 parts of mixed mushroom bran, 0.3 to 0.5 part of nitrobacteria, 0.5 to 0.8 part of brevibacterium glutamicus, 0.2 to 0.3 part of mucor, 2 to 4 parts of an enzyme preparation, 5 to 10 parts of carbonized biomass, 20 to 30 parts of folium ginkgo powder, and 6 to 10 parts of herba centipedae. The pig feed is capable of providing pigs with comprehensive and sufficient nutrients, is convenient to be absorbed and digested, is capable of degrading intestinal tract waste residue by microorganisms, absorbing ammonia substances in intestinal tract and pig dung with functional raw materials, promoting growth of pigs via the cooperation effect of the raw materials, reducing pig dung stink, and improving the environment in hog houses.