The invention discloses an external traditional Chinese medicine for treating furunculosis. The medicine is composed of the following components in parts by weight: 12 to 15 parts of radix astragali, 2 to 4 parts of bletilla striata, 4 to 5 parts of zedoary, 5 to 6 parts of spina gleditsiae, 2 to 4 parts of castor seed, 6 to 8 parts of scorpion, 3 to 5 parts of cottonrose hibiscus, 2 to 4 parts of camphor tree leaf, 1 to 2 parts of oyster, 5 to 6 parts of ardisia crenata, 3 to 5 parts of Chinese violet, 8 to 10 parts of honey-fried licorice, 3 to 5 parts of angelica pubescens, 2 to 4 parts of processed pinellia ternate, 5 to 6 parts of clematis root, 6 to 8 parts of unprocessed rehmannia root, 4 to 5 parts of phellodendron, 1 to 3 parts of helminthostachys zeylanica, 2 to 4 parts of zelkova schneideriana leaf, 1 to 2 parts of pterospermum leaf, 2 to 4 parts of flat-stemmed tetrastigma leaf, and 3 to 4 parts of crownofhorns euphoriae herb. The raw material resource of the external traditional Chinese medicine is wide, the raw materials cooperate with each other to generate functions of clearing heat, removing toxicity, activating blood circulation to remove toxicity, diminishing swelling, relieving pains, draining dampness, eliminating stasis, cooling blood, and dispersing the swelling; and the external traditional Chinese medicine has the advantages of rapid effect, good curative effect, and no relapse on treating furunculosis.