The invention provides a Chinese herbal medicine feed additive. The Chinese herbal medicine feed additive is obtained by mixing components in traditional Chinese medicines of raw materials. The traditional Chinese medicines of raw materials comprises the following components in parts by mass: 15 parts of bark of Chinese corktree, 10 parts of stems of sargentgloryvine, 10 parts of dahurian patriniaherb, 10 parts of Chinese gall, 10 parts of pomegranate rind, 20 parts of spreading hedyotis herb, 15 parts of barbed skullcap herb, 15 parts of purslane, 25 parts of honeysuckles, 20 parts of Chinese pulsatilla roots, 20 parts of kudzuvine roots, 5 parts of coptis chinensis, 10 parts of atractylodes rhizomes, 20 parts of poria cocos, 5 parts of costusroot, 15 parts of medicated leaven, 10 partsof chicken's gizzard-membrane, 15 parts of bighead atractylodes rhizomes, 15 parts of hairy vein agrimonia herb, and 10 parts of Chinese mugwort leaves. The Chinese herbal medicine feed additive is used for feeding cultured fishes with enteritis, has the efficacy of regulating the structure of intestinal flora, and can obviously reduce the proportion and amount of harmful flora in intestinal tracts, improve the beneficial bacteria ratio of lactobacillales to bacillales, relieve the symptoms of the fishes with the enteritis, reduce the mortality of the fishes with the enteritis, and improve theacquiring rate of fishes.