The invention provides feed for preventing pig flu, belonging to the field of pig feed additives, aiming at solving the problem that great loss can be caused in the pig industry because pigs are easy to suffer from flu. The feed for preventing pig flu comprises the following components in parts by weight: 200-250 parts of corn, 200-250 parts of sweet potato, 30-50 parts of rice bran, 80-100 parts of locust tree leaf, 30-50 parts of traditional Chinese preparation, 0.5-1 part of mango leaf extract, 5-10 parts of garlic, 2-5 parts of white sugar, 3-5 parts of salt, and 0.5-1.5 parts of complex vitamin, wherein the traditional Chinese preparation comprises the following components in parts by weight: 3-5 parts of radix bupleuri, 1-3 parts of scutellaria baicalensis, 1-3 parts of the root of kudzu vine, 2-4 parts of white mulberry root-bark, 1-3 parts of fructus forsythia, 1-3 parts of platycodon grandiflorum, 2-4 parts of radix stemonae, 3-5 parts of isodon amethystoides, 3-4 parts of dandelion, 1-2 parts of atractylodes lancea, 2-3 parts of codonopsis pilosula and 1-3 parts of toona sinensis bark. Due to selection of types and content of the raw materials of the feed provided by the invention, the nutrient substances in the feed are reasonably matched, the immunity of pigs is remarkably improved, pig flu can be prevented, and the food security of pork is improved.