The invention discloses Chinese medicinal enema decoction for treating colonitis, which solves the problems of large side effect, high relapse rate, unsatisfactory long-term effect, lasting state of illness, easy relapse after healing and troublesome treatment of the traditional method for treating the colonitis by using Western medicine. The Chinese medicinal enema decoction for treating the colonitis comprises the following medicines serving as raw materials in part by weight: 10 to 35 parts of bletilla, 10 to 35 parts of Chinese pulsatilla root, 10 to 35 parts of sargentgloryvine stem, 10 to 35 parts of amur corktree bark, 15 to 35 parts of lightyellow sophora root, 12 to 35 parts of feverfew, 5 to 25 parts of Chinese gall, 10 to 25 parts of garden burnet root, 5 to 20 parts of dragon's blood, 6 to 15 parts of powdered notoginseng root, 3 to 10 parts of golden thread and 3 to 6 parts of alum. Due to the adoption of the traditional Chinese medicines, the Chinese medicinal enema decoction has the advantages of treatment of both symptoms and root causes, treatment aiming at the root of disease, treatment according to syndrome differentiation and increment/decrement according to syndrome, and the characteristics of simple and understandable treatment method, low price, no toxic or side effect, safety, reliability, wide applicable range, no pain to patients and easy acceptance.