The invention discloses an externally applied plaster prepared from pure traditional Chinese medicines and a preparation method thereof, and belongs to the technical field of pharmacy. The externally applied plaster is a pure traditional Chinese medicine combined formula consisting of decoction and boiling type crude materials and directly added fine materials, and comprises sesame oil, yellow lead, unprocessed common monkshood mother root, unprocessed kusnezoff monkshood root, ningpo yam rhizome, fortune drynaria rhizome, obscured homalomena rhizome, szechuan lovage rhizome, myrrh, native copper, frank incense, twotooth achyranthes root, Chinese angelica, incised notopterygium rhizome root, heracleum, turmeric, shortstalk monkshood root, himalayan teasel root, white mustard seed, wooly datchmanspipe herb, common clubmoss herb, nux vomica, safflower, eucommia bark, acanthopanax bark, musk, long-noded pit viper, centipede, scorpion and borneol serving as raw materials. The finished plaster is prepared by selecting materials, decocting, removing dregs of decoction, refining, adding the yellow lead, releasing fire-toxin and stretching. The prepared plaster is used for treating rheumatism, rheumatic arthritis, scapulohumeral periarthritis, swelling and pain of joints, bone spur, hyperosteogeny, femoral head necrosis and cervical spondylosis, has the effects of activating blood circulation to dissipate blood stasis, strengthening muscles and bones, and quickly diminishing swelling and relieving pain, along with local anesthesia, and has the advantages of short treatment period, definite curative effect, no side effect and the like.