The invention relates to a pure traditional Chinese medicine preparation for recurrent oral ulceration. A recurrent oral ulcer power is prepared by radix ophiopogonis, subprostrate sophora roots, dandelions, bidens bipinnata, cassia twigs, amomum tsaoko, epimedium herb, trichosanthes kirilowii, white paeony root, ligusticum wallichii, humifuse euphorbia herb, fructus aurantii, indian buead, bamboo shavings, Chinese parsnip roots, schizonepeta, coptis chinensis, indigo naturalis, cortex lycii radicis, baked gingers, cattail pollen, folium mori, cyperus rotundus, orange peel, radix stemonae, burdocks, houttuynia cordata and costustoot. The pure traditional Chinese medicine preparation for the relates to a pure traditional Chinese medicine preparation for recurrent oral ulceration is short in treatment course and high in total efficiency, enables ulceration not to easily relapse. In addition, a process is simple, the production cost is reduced, and the economic burden of a patient is relieved.