The invention relates to the field of traditional Chinese medicine preparations, in particular to an external medicine for treating herpes zoster. The external medicine is prepared from, by weight, 0.5-3 parts of deltoid goldthread rhizomes, 0.5-3 parts of Chinese corktree barks, 0.5-3 parts of dandelion herbs, 0.5-3 parts of Ginseng roots, 0.5-3 parts of common cnidium fruits, 0.1-2 parts of myrrh, 0.1-2 parts of borneol, 0.1-2 parts of gypsum, 0.1-2 parts of talc, 0.1-2 parts of cuttle bones, 0.1-2 parts of rhizoma corydalis and 0.1-2 parts of dragon's blood. The external medicine has the major functions of clearing away heat and toxic materials, promoting blood circulation to remove blood stasis and relieving pain and itching and mainly treats the herpes zoster. Through clinical experiments, the pain is relieved 10 minutes after the medicine is applied, blisters shrink within 20 hours, scabs are formed within seven days, and crusts fall off within 15 days. Particularly, healed neuropathic pain and itching symptoms of patients can be eliminated. Hundreds of cumulative patients practically use the external medicine, curative ratio is 100%, and curative effects are remarkable.