The invention provides an external application traditional Chinese drug for treating psoriasis vulgaris. The external application traditional Chinese drug is a agent prepared from the following raw materials, by weight, 5-9 parts of densefruit pittany root bark, 5-9 parts of japanese ampelopsis root tuber, 5-9 parts of lightyellow sophora root, 9-15 parts of fructus kochiae, 5-9 parts of pinellia, 2-5 parts of amur corktree bark, 3-9 parts of common cnidium fruit, 1-5 parts of alum, 6-9 parts of stiff silkworm, 2-4 parts of chaulmoogratree seed, 9-15 parts of dried alum, 6-12 parts of mirabilite, 10-30 parts of wild buckwheat rhizome, 1-4 parts of glaber herba sarcandrae inj, 3-9 parts of japanese pogodatree flower, 2-6 parts of kansu euphorbia root, 9-15 parts of sulphur, 6-9 parts of kaempferia galanga, 3-9 parts of pomegranata rind, 6-15 parts of common bletilla tuber, 3-9 parts of podophyllum, 3-9 parts of siberian cocklebur fruit, 6-12 parts of smoked plum, 9-15 parts of flatspine pricklyash, 6-9 parts of psoralea corylifolia, 3-9 parts of common camptotheca fruit, 9-15 parts of Chinese soapberry fruit, and 1-30 parts of Chinese azalea flower. According to the traditional Chinese drug preparation of the present invention, the traditional Chinese drug five element theory is adopted, the medicine is applied aiming at the symptoms according to the psoriasis vulgaris etiopathogenisis, and the external application traditional Chinese drug has effects of heat clearing, detoxification, blood activating, and collateral dredging, and is suitable for more than 99% psoriasis vulgaris patients.