The invention belongs to the technical field of traditional Chinese medicines and relates to a plaster for treating rheumatoid bone diseases and a preparation method thereof. The plaster for treating rheumatoid bone diseases is prepared from 45 traditional Chinese medicines of Chinese angelica, nux vomica, stiff silkworm, aconite root, radix aconite, safflower, divaricate saposhnikovia root, peach kernel, medicinal cyathula root and the like. The plaster for treating rheumatoid bone diseases is designed on the basis of a secret prescription handed down from ancestors of the inventor according to years of clinical experiences of the inventor and is prepared by repeated experiments, and thus the plaster has unique curative effects on refractory facial paralysis. The plaster for treating rheumatoid bone diseases has a reasonable and rigorous formula, and can be prepared by unique processes. Through use of the plaster for treating rheumatoid bone diseases, wry mouth, oblique eyes and facial spasm caused by facial paralysis can be cured fast. The plaster for treating rheumatoid bone diseases acts fast, and has a short treatment course, a high cure rate and a low cost. The plaster provided by the invention has unique curative effects on rheumatism, rheumatoid arthritis, back and leg pain, scapulohumeral periarthritis, numbness of limbs, sciatica, hyperostosis, lumbar disc herniation, cervical spondylosis, ankylosing spondylitis, hyperplasia of mammary glands, various stubborn pains, fracture sequelae, wry mouth and oblique eyes.