The invention relates to an externally applied traditional Chinese medicine preparation, in particular to an externally applied traditional Chinese medicine composition for treating bedsores. The externally applied traditional Chinese medicine composition is characterized by comprising the following traditional Chinese medicine raw materials in parts by weight: 80-150 parts of live earthworm, 280-320 parts of sugar, 0.2-1.5 parts of mercurous chloride and 0.8-2.0 parts of verdigris. The preparation method of the externally applied traditional Chinese medicine composition comprises the following steps of: adding the live earthworms to the sugar in a certain proportion and uniformly stirring; then grinding the mercurous chloride and the verdigris in a certain proportion, and filtering obtained fine powder by a filter screen of 150 meshes; and finally mixing the fine powder into the mixture of the earthworms and the sugar and uniformly stirring. The prepared traditional Chinese medicine composition is externally applied to a pathological change part, and symptoms can be relieved within a short period and healed within 3-8 days. The externally applied traditional Chinese medicine composition has safety, convenience, quick curative effect, high cure rate and low treatment cost.