A traditional Chinese medicine potion mainly for treating acute and chronic ulcerative colitis is composed of radix astragali, Chinese angelica, cassia twig, white peony root, dark plum, scorched hawthorn, cinnamon, banksia rose, hericium erinaceus, alga, prunella vulgaris, licorice and deionized water. The traditional Chinese medicine potion comprises, by mass parts, 20-25 parts of radix astragali, 15-20 parts of Chinese angelica, 15-20 parts of cassia twig, 20-25 parts of white peony root, 10-15 parts of dark plum, 5-10 parts of scorched hawthorn, 3-5 parts of cinnamon, 3-5 parts of banksia rose, 3-5 parts of hericium erinaceus, 5-8 parts of alga, 3-5 parts of prunella vulgaris, 15-20 parts of licorice and 800-1200 parts of deionized water. Radix astragali, Chinese angelica, cassia twig, white peony root, dark plum, scorched hawthorn, cinnamon, banksia rose, hericium erinaceus and licorice are in compatibility to be used for conditioning and treatment of acute and chronic ulcerative colitis, the immunity of the organism can be enhanced if the traditional Chinese medicine potion is used for a long term, yin and yang balance is adjusted, and thus a whole regulation effect is brought into play to achieve the goal of treating ulcerative colitis.