The invention relates to a medicine for treating psoriasis, belongs to the technical field of traditional Chinese medicines, and aims at solving the technical problem that a medical for treating psoriasis with remarkable curative effect and small side effect is provided. The technical scheme provided by the invention is as follows: the medicine comprises the raw materials in parts by weight as follows: 8-15 parts of the fruit of Chinese wolfberry, 10-16 parts of radix paeoniae alba, 6-15 parts of radix sophorae flavescentis, 8-20 parts of the root of red-rooted salvia, 6-12 parts of Scutellaria baicalensis, 15-35 parts of Oldenlandia diffusa, 6-12 parts of American ginseng, 6-15 parts of radix pseudostellariae, 6-12 parts of Angelica sinensis, 10-30 parts of oyster, 10-30 parts of concha haliotidis, 10-30 parts of concha haliotidis threads, 6-10 parts of blood heat added lithospermum, 6-10 parts of indigo naturalis, 8-15 parts of blood dry added prepared rehmannia root, 8-20 parts of Polygonum multiflorum, 10-30 parts of blood stasis added Caulis Spatholobi, 10-14 parts of madder, 0.1-3 parts of pseudo-ginseng powder, 6-10 parts of heat toxin added Coptis chinensis, 6-13 parts of damp-heat type added jasmine and 8-15 parts of semen coicis. The medicine provided by the invention has good effect for treating various types of psoriasis.