The invention provides a traditional Chinese medicinal composition for treating recurrent oral ulcer, and relates to traditional Chinese medicinal compositions. The traditional Chinese medicinal composition is characterized by comprising the following raw materials in parts by weight: 10-15 parts of cortex phellodendri, 3-8 parts of coptis chinensis, 5-10 parts of scutellaria baicalensis, 30-50 parts of gypsum, 10-15 parts of radix asparagi, 10-15 parts of ophiopogon japonicus, 10-15 parts of cape jasmine, 10-15 parts of fructus forsythiae, 15-20 parts of rhizoma phragmitis, 10-15 parts of raw rehmannia root, 10-15 parts of prepared rehmannia root and 10-18 parts of dendrobe, as well as optional 10-30 parts of bamboo leaf, 3-8 parts of liquorice and 10-20 parts of lalang grass rhizome. The traditional Chinese medicinal composition for treating recurrent oral ulcer is unique in compatibility and smart in preparation, and has the advantages of good heat-clearing and internal fire-purging function, good treatment effect, quick curative effect, low treatment cost and hard relapse when being used for treating recurrent oral ulcer caused by hyperactivity of fire due to yin deficiency.