The invention discloses a Chinese herbal medicine additive for reducing the stress reaction of a weaned pig. The Chinese herbal medicine additive comprises the ingredients of: codonopsis pilosula, rhizoma atractylodis macrocephalae, poria cocos, Chinese yam, astragalus mongholicus, lotus seed, fried green beans, fried coix seed, radix ophiopogonis, schisandra chinensis, polygonum multiflorum, glossy privet fruit, eclipta alba, date kernel, platycladi seed, cortex albiziae, polygala tenuifolia, uncaria rhynchophylla, keel, oyster, coked medicated leaven, coked maltum, scutellaria baicalensis, cape jasmine, cortex moutan, red paeony root, dandelion, radix isatidis, cyrtomium fortunei, fried betel nut, purslane and liquorice. The Chinese herbal medicine additives disclosed by the invention in feed accounts for 1.5-2wt% in feed; and by adopting the Chinese herbal medicine additive, the immunity of the weaned pig can be improved, and the stress reaction of the weaned pig can be reduced. The Chinese herbal medicine additive has the characteristics of low price and no toxic and side effect.