Chinese herbal medicine feed additive for weaned pig and preparation method thereof

The invention relates to a Chinese herbal medicine feed additive for a weaned pig and a preparation method thereof. The Chinese herbal medicine feed additive is prepared from a Chinese herbal medicine concentrated solution, medical stone powder, peony cake powder, and starch as an auxiliary material according to a weight ratio of 65: 5: 5: 30. Raw materials of the Chinese herbal medicine concentrated solution comprise bitter orange, imperata rhizome, bighead atractylodes rhizome, licorice, isatis root, dandelion, cordate houttuynia, honeysuckle flower, medicated leaven, haw, calcined oyster shell powder, medical stone powder and alum powder. The Chinese herbal medicine feed additive can improve weaned pig immunity, improve an intestine mucosa absorption function and relieve weaned pig stress syndrome, has the effect of preventing and treating diseases and supplying nutrients, and can promote weaned pig growth and development. The preparation method can prepare the Chinese herbal medicine feed additive particles by traditional Chinese medicine microgrinder-based crushing, steam heating tank-based extraction, continuous backflow extraction and spray drying, can realize extraction of effective nutrients and medicinal components of Chinese herbal medicines, and can remove Chinese herbal medicine wood fiber components having large volumes. The Chinese herbal medicine feed additive can be preserved easily and improves economic benefits of culture enterprises.