The invention relates to a feed composition for improving immunocompetence of a live pig. The feed composition comprises the following components in parts by weight: 14-16 parts of solanum tuberdsm seedlings, 1-3 parts of apple vinegar, 0.5-1 part of dry red pepper, 1-3 parts of red tea, 0.5-1 part of lumbricus, 1-3 parts of cedrela sinensis leaves, 0.5-1 part of edible amaranth seeds, 0.5-1 part of myristica fragrans, 1-3 parts of banana skins, 1-3 parts of bone meal, 1-3 parts of malt, 4-6 parts of bean pulp, 2-4 parts of wine, 2-4 parts of broad bean skins, 8-12 parts of water chestnut leaves, 2-4 parts of pomegranate barks, 4-6 parts of peanuts, 4-6 parts of pine nuts, 1-3 parts of chestnut shells, 2-4 parts of table salt, 1-3 parts of baking soda, 4-6 parts of red kojic rice, 4-6 parts of sorghum roots, 4-6 parts of se-enriched yeast, 4-6 parts of rice bran, 4-6 parts of maize, 1-3 parts of gynostemma pentaphylla, 1-3 parts of honey, 1-2 parts of loofah sponge, 1-3 parts of platycodon grandiflorum, 1-2 parts of Chinese actinidia roots, 3-5 parts of liquorice, 1-3 parts of green grass, 1-3 parts of saffron crocus, 1-3 parts of wheat bran, 1-2 parts of tomato leaves, 1-3 parts of wild grape vines, 1-3 parts of buckwheat and 1-3 parts of oat. The feed composition provided by the invention is reasonable in proportion and rich in nutrition and the live pig eating the feed is strong in immunity.