The invention relates to a traditional-Chinese-medicine composition for treating the psoriasis by oral administration and external applying and belongs to the traditional-Chinese-medicine composition for treating the psoriasis. A medicine for oral administration comprises the following components in parts by weight: 50-60 parts of radix rehmanniae, 50-60 parts of bighead atractylodes rhizome, 50-60 parts of honeysuckle, 50-60 parts of duckweed, 40-50 parts of salvia miltiorrhiza, 40-50 parts of cortex moutan, 40-50 parts of angelica sinensis, 40-50 parts of cortex dictamni, 40-50 parts of belvedere fruit, 40-50 parts of fructus forsythiae, 40-50 parts of burdock, 30-40 parts of radices lithospermi, 30-40 parts of cortex kadsurae radicis, 30-40 parts of radix paeoniae rubra, 30-40 parts of scutellaria baicalensis, 30-40 parts of golden cypress and 30-40 parts of poria cocos; a traditional Chinese medicine for external applying comprises the following components in parts by weight: 20-30 parts of hydnocarpus hainanensis, 20-30 parts of radix stemonae, 15-20 parts of golden cypress, 15-20 parts of radix sophorae flavescentis, 10-15 parts of realgar, 3-5 parts of chalcanthite, 3-5 parts of venenum bufonis and 1-3 parts of musk. The traditional-Chinese-medicine composition adopts oral administration and external applying, can treat both symptoms and root causes; the pills of the traditional-Chinese-medicine composition for oral administration have the effects of clearing heat and removing toxicity, cooling blood and dispelling wind, activating blood and dissolving stasis and promoting dampness; simultaneously, by combination with the traditional-Chinese-medicine composition preparation for external applying, the effects of dispelling wind, eliminating dampness, removing toxicity, eliminating inflammation, alleviating pain and itching can be achieved, the psoriasis can be removed, the health of the skin is restored and the relapse is not easy to occur.