The invention relates to a plaster for treating traumatic injury and a preparation method thereof. The plaster is prepared from the following raw materials in parts by weight: 1-20 parts of safflower, 1-20 parts of ground beetle, 1-20 parts of selaginella tamariscina, 1-20 parts of dragon's blood, 1-20 parts of bamboo pseudo-ginseng, 1-20 parts of rhizoma arisaematis, 1-20 parts of acorus calamus, 1-20 parts of pseudo-ginseng, 1-20 parts of hematoxylon, 1-20 parts of caulis spatholobi, 1-20 parts of sargentgloryvine stem, 1-20 parts of rhizoma cibotii, 1-20 parts of cyathula officinalis and 1-20 parts of pawpaw. The traditional Chinese medicine composition is prepared from 1-20 parts of frankincense, 1-20 parts of myrrh, 1-20 parts of peach kernels, 1-20 parts of beautiful millettia roots, 1-20 parts of kadsura coccinea, 1-20 parts of rhizoma drynariae, 1-20 parts of eupatorium japonicum, 1-20 parts of polygonum cuspidatum, 1-20 parts of amber, 1-20 parts of wikstroemia inula, 1-20 parts of radix clematidis, 1-20 parts of manyprickle acanthopanax bark, 1-20 parts of cinnamon, 1-20 parts of gentiana macrophylla, 1-20 parts of asarum, 1-20 parts of schizonepeta, 1-20 parts of notopterygium roots, 1-20 parts of radix angelicae, 1-20 parts of elecampane, 1-20 , 1-20 parts of rhizoma curcumae longae, 1-20 parts of black ants, 1-20 parts of radix aconiti and 1-20 parts of radix aconiti agrestis. The plaster for treating traumatic injury prepared by the invention is small in dosage, quick in effect, free of toxic and side effects due to pure traditional Chinese medicine components and convenient to use.