The invention discloses a 
traditional Chinese medicine for treating 
chronic colitis and a preparation method thereof. The 
traditional Chinese medicine is prepared from the following raw materials in parts by weight: 15 to 22 parts of tuber of dwarf lilyturf, 10 to 14 parts of 
morinda officinalis, 5 to 9 parts of 
rehmanniae radix, 6 to 12 parts of folium isatidis, 16 to 22 parts of licorice, 9 to 14 parts of 
alpinia oxyphylla, 4 to 9 parts of peach seed, 12 to 18 parts of dark plum, 6 to 11 parts of 
rabdosia rubescens, 3 to 6 parts of balloonflower root, 14 to 19 parts of 
broom cypress fruit, and 4 to 8 parts of leaf of 
eucalyptus robusta. The preparation method comprises the following steps: washing raw materials, 
cutting and 
drying raw materials, adding water into tuber of dwarf lilyturf, 
morinda officinalis, and the like, decocting tuber of dwarf lilyturf, 
morinda officinalis, and the like for three times, condensing the decoction, carrying out 
alcohol precipitation, 
drying the precipitate to obtain extract (A); adding 
ethanol into 
rabdosia rubescens, balloonflower root, and the like, performing 
reflux, 
drying to obtain extract (B); merging extract (A) and extract (B), 
grinding, and mixing. The provided 
traditional Chinese medicine can quickly relieve the clinical symptoms of 
ulcerative colitis patients such as 
diarrhea, pus and blood stool, stomachache, and the like; can prominently improve the 
pathological change of 
intestinal mucosa, eliminate the 
inflammation medium, and promote the healing of ulcer; and achieves a good 
curative effect. The total effective rate is 96%, and no adverse reaction, 
side effect, or toxic effect has been found.