The invention discloses an externally-used medicament for treating skin diseases, which is prepared from Chinese honey locust, Clematis chinensis, hooked uncaria, arisaema tuber, cnidium fruit, boneol, camphor, menthol, dried alum, broom cypress fruit, cactus, sea tangle, vitamin C, ciprofloxacin hydrochloride, vitamins, griseofulvin, abomacetin enteric coated tablet, dexamethasone acetate tablet, compound sulfalene oxazole tablet, sesame oil, edible glycerol, seed powder of Gorgon euryale and 20 Degree light wine.