The invention provides a formula of traditional Chinese medicine for treating rheumatoid arthritis. The formula is characterized by comprising the following components in parts by weight: 9-12 parts of fructus psoraleae, 12-24 parts of prepared rhizome rehmannia, 12-18 parts of teasel, 9-12 parts of epimedium herb, 6-9 parts of roasted armadillo, 9-12 parts of divaricate saposhnikovia root, 6-12 parts of prepared radix aconiti lateralis, 10-20 parts of drynaria rhizome, 9-15 parts of cassia twig, 9-12 parts of red paeony root, 9-12 parts of white paeony root, 9-15 parts of anemarrhena, 10-12 parts of notopterygium root, 10-12 parts of wild celery, 9-12 parts of loose knot, 6-10 parts of Chinese polyphaga, 3-6 parts of Chinese ephedra, 6-10 parts of atractylodes lancea, 9-15 parts of clematis root, 25-35 parts of common clubmoss herb, 9-15 parts of achyranthes bidentata and 9-12 parts of roasted tiger bone. In the formula provided by the invention, principal, assistant and adjuvant ingredients have obvious effects and are synergic, compatibility of medicines is perfect; root causes are addressed, symptoms are treated, disease differentiation is discriminated, whole treatment is realized; after a patient takes the medicine, limb joint swelling pain is alleviated, and the patients has strong physical strength, good face colour is moist, and high mobility, and the formula provided by the invention is superior to any common medicine for treating rheumatism.