The invention discloses a traditional Chinese medicinal powder for treating dental ulcer. The powder is prepared from the following raw materials in parts by weight: 10-15 parts of pseudo-ginseng, 15-20 parts of coptidis rhizoma, 18-24 parts of cortex phellodendri, 20-25 parts of musk, 16-22 parts of frankincense, 14-18 parts of alysicarpus vaginalis, 10-15 parts of myrrh, 5-10 parts of palm leaf, 8-14 parts of indigo naturalis, 15-20 parts of rhizoma atractylodis macrocephalae, 12-16 parts of Chinese ilex leaf, 18-24 parts of radix boehmeriae tricuspis, 7-13 parts of banana peel, 5-10 parts of puffball, 10-15 parts of wild chrysanthemum, 9-16 parts of catechu, 4-8 parts of radix scrophulariae, 6-12 parts of grape seed, 13-19 parts of fructus forsythiae, 12-18 parts of cortex dictamni, 5-10 parts of calamine, 10-15 parts of boric acid, 5-10 parts of borneol. The medicine has the effects of clearing heat and cooling blood, diminishing inflammation and swelling, inhibiting bacteria and relieving pain, eliminating necrotic tissues and promoting granulation, activating blood to remove stasis, eliminating dampness and astringing sores and the like, can be directly applied to an ulcer surface, is good in drug absorption, can remarkably improve micro-circulation of blood on the ulcer surface and promote healing acceleration of the ulcer surface, can shorten the treatment time, is quick in response and short in course of treatment, does not have toxic or side effect or irritation, prevents relapse after healing, is convenient to use and low in treatment cost, and is worthy of clinical popularization and application.