The invention relates to a traditional Chinese medicine oral liquid for treating viral diseases of livestock and poultry. The traditional Chinese medicine oral liquid is prepared by virtue of the following steps: firstly, extracting mulberry leaf, weeping forsythia capsule, honeysuckle, baikal skullcap root, coptis chinensis, liquorice root, heartleaf houttuynia herb, hawthorn fruit, garlic, root of sinkiang arnebia, white peony root, pangolin scales, Japanese flowering fern rhizome, ash bark and common anemarrhena rhizome to obtain a concentrated liquor; and secondly, extracting mint and root of lobed kudzuvine to obtain a distillate, and blending the concentrated liquor with the distillate to obtain the oral liquid. In the way, the extraction content of the mint oil and the puerarin can be greatly increased; besides, the root of lobed kudzuvine, the heartleaf houttuynia herb, the Japanese flowering fern rhizome and the common anemarrhena rhizome are taken as the monarch drugs, while the coptis chinensis, the baikal skullcap root, the white peony root, the pangolin scales, the honeysuckle and the mulberry leaf are taken as the ministerial drugs, the weeping forsythia capsule, the mint, the garlic and the ash bark are taken as the adjuvant drugs, and the liquorice root is taken as the conductant drug, all the components are matched with each other to achieve a synergistic effect; the traditional Chinese medicine oral liquid has the effects of inhibiting and killing viruses, regulating immune functions, inducing the production of interferon and resisting toxins, is capable of effectively treating viral diseases without drug residue and free from toxic and side effects, and does not cause drug resistance.