The invention discloses antiboitic-free feed for the second stage of fattening pigs. The feed is prepared according to the formula containing the following components in parts by weight: 45-65% of corn, 13-20% of soybean meal, 8-15% of bran, 0.2-0.3% of mineral premixed agents, 0.02-0.03% of vitamin premixed agents, 0.1-0.2% of calcium hydrogen phosphate, 0.1-0.5% of stone powder, 0.1-0.4% of table salt, 0.2-0.35% of epimediums, 0.1-0.3% of eucommia ulmoides, 0.05-0.08% of star anise, 0.1-0.2% of dried ginger, 0.05-0.08% of rhodiola roots, 0.1-0.3% of radix fici simplicissimae, 0.05-0.08% of uncaria, 0.1-0.15% of senna obtusifolia, 0.03-0.05% of orange peel, 0.15-0.2% of astragalus membranaceus, 0.1-0.2% of codonopsis pilosula, 0.05-0.08% of licorice roots, and 0.005-0.02% of tea tree oil. The preparation method of the antibiotic-free feed for the second stage of the fattening pigs comprises the following specific steps of receiving, cleaning, metering, crushing, mixing ingredients according to a recipe, mixing, pelletizing, sieving with classifying screens, adding liquid, and packaging for storing. The feed disclosed by the invention solves the problems of drug remaining, drug tolerance and environmental pollution due to antibiotics added in the feed. In addition, with the feed in which Chinese herbal medicine is added in comparison with traditional feed, the immunity of pigs can be improved, the disease attack risk of animals is reduced, and at the same time, the special flavor of pork products can be improved.