The invention discloses an external unguent for treating burn. The unguent comprises the following raw materials in parts by weight: 20-30 parts of sensitive plant, 10-15 parts of lithospermum, 10-15 parts of golden cypress, 10-12 parts of peperomia dindygulensis miq, 6-10 parts of flos paulowniae, 10-14 parts of ophiopogon root, 10-13 parts of radix rehmanniae recen, 8-10 parts of dandelion, 10-14 parts of fried garden burnet, 10-13 parts of pseudo-ginseng, 6-8 parts of flowers carthami, 3-4 parts of the root of kudzu vine, 3-5 parts of madder, 4-7 parts of Coptis chinensis, 10-12 parts of rhizoma bletillae, 8-11 parts of rhizoma atractylodis, 10-13 parts of Ixeris japonica, 6-7 parts of mint, 2-3 parts of Elaeagnus, 3-4 parts of liquorice, 8-10 parts of ash bark, 4-5 parts of dried alum, 10-15 parts of rosin, 6-10 parts of radix sophorae flavescentis, 6-10 parts of smoked plum, 10-12 parts of borneol, 200-260 parts of sesame oil and 100-150 parts of beewax. The unguent disclosed by the invention has the effects of preventing bacteria, diminishing inflammation, relieving pain, eliminating swelling and resisting irritability. The infection probability is low, and the burn is not specially treated. The unguent has low sterile demand to the trauma and is simple in using method. The unguent is not combined with other antibiotics, and the unguent is short in curative period, quick-acting and free from scars.