The invention discloses a Chinese herbal medicine buccal tablet for treating dental ulcer, which is prepared through repeated verification of years' clinic experiments and is prepared by chorion ovi, calomel, minium, lithargite, red halloysite, mentha haplocalyx, dandelion, catechu, honeysuckle, Siraitia grosvenorii root, mosla dianthera, aloe, loranthus parasiticus, lowigite, curcuma aromatica, radix rhapontied, no name, alone leave hyacinth bletilla, rosa multiflora leaves, radix astragali, anemone hupehensis, ophioglossum vulgatum and ball cactus. The Chinese medicine matching accords with a traditional Chinese medicine theory, a prescription adopts Chinese medicines as raw materials, required components are prepared through dipping, decoction, crushing, pressing and the like, and drugs, tablets, capsules and the like are prepared through formulation. The Chinese herbal medicine buccal tablet for treating dental ulcer starts from removing corrosion and fast removing deformed mucosa, and diminishes inflammation and stops pain for dental ulcer so as to promote ulcer to heal.