The invention discloses a traditional Chinese medicine composition for treating skin diseases. An oral part of the composition comprises the following Chinese herbal medicine materials in weight portion: 6 to 9 portions of honeysuckle, 6 to 9 portions of wild chrysanthemum, 3 to 6 portions of radix isatidis, 6 to 9 portions of golden buckwheat rhizone, 3 to 6 portions of phellodendron, 3 to 6 portions of radix sophorae falvescentis, 6 to 9 portions of southernwood, 3 to 6 portions of glabrous greenbrier rhizome and 3 to 6 portions of liquorice; an external part of the composition comprises the following Chinese herbal medicine materials in weight portion: 6 to 9 portions of caprophyl, 3 to 6 portions of thunder god vine, 3 to 6 portions of tungoiltree, 3 to 6 portions of golden larch bark, 3 to 6 portions of Chinese tallow tree skin, 3 to 6 portions of jequirity bean, 3 to 6 portions of cortex meliae, 6 to 9 portions of nutgall, 3 to 6 portions of radix aconite and 3 to 6 portions of trailing plant. The medicine has the efficacies of clearing away heat, detoxifying, destroying parasites, relieving itching, dispersing pathogenic wind, drying moistness, cooling and activating blood, discharging dirt, drawing out pus and the like. The medicine has rapid action and good curative effect on skin infection, common furuncle, boil, sore, carbuncle, erysipelas and the like and has remarkable efficacies on eczema, dermatitis, acariasis, fester, hives, cutaneous pruritus, syphilitic skin lesions and the like; and the effective rate of treatment is above 90 percent.