The invention relates to a feed for improving the lean meat factor of a fattening pig. The feed for improving the lean meat factor of the fattening pig comprises the following materials: bean pulp, corn, peanut meal, bran, mountain flour, calcium bicarbonate, antioxidant, compound vitamin, compound microelement, salt, lysine and traditional Chinese medicine additive, wherein the traditional Chinese medicine additive comprises the following bulk drugs: astragalus mongholicus, medlar, poria cocos, herba epimedii, hawthorn, fennel, codonopsis pilosula, pericarpium citri reticulatae, ligusticum wallichii, liquorice, malt, rhizome atractylodis, quispualis indica, radix achyranthis bidentatae and dandelion. By adopting a new formula and the traditional Chinese medicine additive, the nutritional requirement of the fattening pigs is met, the palatability is good, the growth rate of lean-meat-type fattening pigs is high, the lean meat factor is high, the body type is plump, the anti-stress capability is strong, the meat is bright-colored and the drip loss is low. Besides, the feed has the advantages of little toxic and side effect, no drug tolerance, no residue and the like, and the side effect on the food safety is reduced.