The invention discloses a Chinese herba preparation for treating chronic ulcerative colitis. In the traditional Chinese medicine, the chronic ulcerative colitis is categorized as dysentery, diarrhea and intestinal afflux, and caused by dysfunction of the spleen in transport, internal hot and humid condition, large intestine hot-damp accumulation, intestial injury and sepsis syndrome due to eating disorder and emotional disorder and overwork. In order to solve the problems, the Chinese herba preparation is decocted into decoction in preparation department by adopting the following traditional Chinese materials: white flower cacalia seed, sedum sarmentosum, abutilon fiber, manyleaf meadowure rhizome and root, salvia chinensis, mock-strawberry, verbena, tropaeolum, potentilla cryptotaeniae, humifuse euphorbia herb, campsis grandiflora, panax japonicas, folium callicarpae pedunculatae, white atractylodes rhizome, rhizoma polygonati, arillus longan and liquorice. According to the clinical test, the total effective rate is 95.6%, and the recovery rate and colonoscopy results before and after the treatment are remarkably better than those of the control group.