The invention discloses a traditional Chinese medicine enema for treating ulcerative colitis, wherein traditional Chinese medical science holds that the ulcerative colitis belongs to the domain of 'diarrhoea', 'bloody stool' and 'dysentery', and the pathogenesis mostly is mainly caused by feeling six viruses of wind, cold, heat, dampness and dryness, having internal damage by excess of seven emotions and damaging spleen and stomach, constraining large intestine by the dampness and heat to obstruct the intestinal Qi function and injure the vein to cause blood and meat rot to emerge ulcer finally. Therefore, the traditional Chinese medicine enema provided by the invention chooses traditional Chinese medicines including japanese claw fern herb, caulis arcangelisiae, phellodendron bark, cordate houttuynia, folium glochidii eriocarpi, featherycleft horsegentian fruit, moutan bark, frankincense, bletilla striata, red halloysite and licorice root having functions of clearing away heat and toxicity, activating blood circulation and removing blood stasis and removing swelling and promoting granulation to process into the enema. After clinical tests in the hospital, the total efficiency reaches to 97.2%, the clinical symptom improvement is obviously superior to that of a contrast group, the side effect is low and the treatment cost is low. Therefore, the enema provided by the invention is suitable for clinical promotion and application.