The invention provides Chinese medicinal composition powder for treating psoriasis. The powder is prepared from the following traditional Chinese medicines in parts by weight: 2-6 parts of pangolin, 2-6 parts of angelica, 2-6 parts of saffron crocus, 2-4 parts of root bark of the peony tree, 2-4 parts of root of red-rooted salvia, 2-6 parts of honeysuckle, 2-4 parts of coptis, 2-4 parts of radix sophorae flavescentis, 2-4 parts of densefruit pittany root-bark, 2-4 parts of root-bark of Chinese wolfberry, 2-4 parts of paniculate swallowwort root, 2-4 parts of cedar leaf, 2-4 parts of tuber fleeceflower stem, 2 parts of snake slough, 2 parts of atractylodes lancea, 2 parts of agilawood, 2 parts of indigo naturalis, 2 parts of cicada slough, 2 parts of pearl, 0.5 part of borneol and 0.5 part of liquoric root. The invention further provides an ointment for treating the psoriasis. The ointment contains the minimum parts by weight of Chinese medicinal composition powder and is prepared by mixing with auxiliary components.