The invention relates to a 
traditional Chinese medicine and a preparation method thereof, in particular to an external use 
drug for treating 
rheumatoid arthritis and a preparation method thereof. The external use 
drug comprises, by weight, of 8-12 parts of 
cassia twig, 18-22 parts of 
drynaria rhizome, 18-22 parts of radix rehmanniae, 18-22 parts of 
rehmannia glutinosa, 18-22 parts of herbaceous peony red root, 28-32 parts of 
lycopodium clavatum, 10-14 parts of silkworm 
larva, 8-12 parts of dried body of 
ground beetle, 8-10 parts of ephedra, 8-10 parts of qiang radix angelicae pubescentis, 8-10 parts of radices sileris and 16-20 parts of radix achyranthis bidentatae. All constituents are made into 
fine powder to be filled in a 
medicine bag in a shape of a double-layer glove or double-layer sock. When the external use 
drug is used, the vinegar is sprayed on the surface of the 
medicine bag which is placed in a 
microwave oven to heat 2 minutes, a patient 
lime with a glove or sock made of pure cotton is sleeved in the 
medicine bag, the medicine bag can be repeatedly heated, and a patient wears the drug glove or sock for 30-40 minutes each time. The external use drug for treating the 
rheumatoid arthritis organically bonds various constituents, gives full play to pharmacodynamic effects on the various constituents, absorbs and permeates through 
skin, has effects on human bodies, is slow in pharmacodynamic effects, can release stably, avoids inconvenience brought by 
oral medicine, can be easily accepted by the patient and is good in pharmacodynamic effects.