The invention provides an orally administered liquid for treating canker sore. The orally administered liquid for treating the canker sore is prepared by the active pharmaceutical ingredients including bitter gourds, apples, carrots, tomatoes, chalcanthite, red peony root medicine, green tangerine peel, rhizoma bolbostemmae, radish seeds, cacumen biotae, borneol, honeysuckle, wrinkled giant hyssop, costustoot, fortune eupatorium herb, the root of kudzu vine, ruddle, mint, folium phyllostachys, radix scrophulariae, Chinese yam, moutan bark, rhizoma alismatis, root of Chinese thorowax, rhizoma cimicifugae, cortex lycii radicis, wild chrysanthemum flower, fructus amomi, parasitic loranthus and fruit of Chinese magnoliavine. The orally administered liquid for treating the canker sore is prepared by Chinese medicinal herbs combined with food crude materials, is prepared by repeated verification of clinical trials and scientific principles of formulating prescription and conforms to the theory of traditional Chinese medicine, and is prepared by the active pharmaceutical ingredients easy to obtain, low in price, scientific in formula, short in cure time, good in treatment effect, and capable of effectively regulating human mechanism, improving human body blood circulation and effectively alleviating pains of patients.