The invention discloses a traditional Chinese medicine for treating psoriasis. The traditional Chinese medicine is prepared from the following medicinal raw materials in parts by weight: codonopsis pilosula, platycodon root, Indian buead, ginseng, danshen root, lotus seed, Indian buead, flower of silktree albizzia, Chinese date, combined spicebush root, talc, paniculate swallowwort root, jackinthepulpit tuber, manchurian wildginger, tuber fleeceflower stem, fermented soya beans, all grass of serrulate clearweed, coptis chinensis, baikal skullcap root, cape jasmine fruit, lotus plumule, yerbadetajo herb, peach seed, shinyleaf pricklyash root, dried rehamnnia root, coix seed, virgate wormwood herb, rhinoceros horn and stiff silkworm. According to the traditional Chinese medicine disclosed by the invention, the medicinal raw materials are combined and coordinated to play roles in invigorating qi, moistening the lung, nourishing yin, reducing dryness, regulating qi and soothing the nerves; the traditional Chinese medicine has clear curative effects on psoriasis and ensures that the pain of patients can be effectively relieved and the recovery of dander parts can be accelerated; and meanwhile, body mechanisms of the patients can be conditioned, the repeated occurrence of psoriasis can be reduced and prevented, and the purposes of treating both symptoms and root causes without side effects can be achieved.