The invention discloses a traditional Chinese medicine composition for treating periodontitis, belonging to the field of traditional Chinese medicines. The traditional Chinese medicine composition is prepared from the following raw material medicines in parts by weight: 12 parts of raw gypsum, 18 parts of rhizome of rehmannia, 9 parts of root-bark of tree peony, 9 parts of common anemarrhena rhizome, 10 parts of green tangerine peel, 15 parts of buerger pipewort flower, 8 parts of herba ecliptae, 6 parts of hairyvein agrimonia herb and bud, 10 parts of honeysuckle flower, 9 parts of divaricate saposhnikovia root, 6 parts of cicada slough and 3 parts of liquoric root. The traditional Chinese medicine composition disclosed by the invention has the beneficial effects that the traditional Chinese medicine composition adopts natural traditional Chinese medicines as raw materials, is accurate in curative effect, does not have toxic or side effects, can be used for effectively curing periodontitis, and ensures that the total effective rate can reach 100%; and periodontitis is not easy to relapse after being cured.