The invention relates to the field of a traditional Chinese medicine, and in particular relates to a traditional Chinese medicine for treating dental ulcer. The traditional Chinese medicine is prepared from the following raw materials: cornu bubali, radix rehmanniae, root bark of peony tree, jasmine, coptis chinensis, radices lithospermi, indigo naturalis, radish seed, angelica, safflower, stiff silkworm, bitter orange, mangnolia officinalis, root of straight ladybell, motherwort fruit, semen lepidii, divaricate saposhnikovia root, nutgrass galingale rhizome, rhizoma alismatis, reed rhizome, liquorice, mulberry leaf, chrysanthemum, dandelion, hedyotis diffusa, herba epimedii, root of red-rooted salvia, fructus forsythiae, root of chinese barberry, rhizoma dioscoreae nipponicae, cassia twig, sabia japonica, Chinese starjasmine stem, kadsura pepper stem, Tuckahoe, polygala tenuifolia, fruit of Chinese magnoliavine, prepared rhizome of rehmannia and Chinese yam. The traditional Chinese medicine for treating dental ulcer is obvious in effect and free from toxic and side effect.