The invention discloses a biologically fermented complete feed for pigs, which is prepared from 40000g of bacteria solution, 25000g of core material, 770000g to 790000g of feedstuff and 145000g to 165000g of water; the bacteria solution consists of 100g of bacillus subtilis, 60g of enterococcus faecalis, 100g of saccharomyces cerevisiae, 1000g of glucose, 250g of starch, 250g of whey powder, and 50000g of well water; and the core material consists of 8000g to 10000g of salt, 0g to 3000g of montmorillonite, 1000g to 2000g of bacillus subtilis, 0g to 1000g of bacillus licheniformis, 250g to 350g of saccharomycetes, 0g to 150g of lactobacillus acidophilus, 0g to 250g of enterococcus faecalis, 9000g to 10000g of mountain flour, 1500g to 2000g of lysine, 0g to 1150g of methionine, and 0g to 500g of trace elements and minerals. The storage time of the complete feed disclosed by the invention can be six months or longer, is convenient to use, is fed stage by stage, and increases the feed utilization rate and body immunity.