The invention provides application of sutterella wadsworthensis in treating or preventing rheumatoid arthritis or related diseases thereof, and further provides a pharmaceutical composition, a medicine, a food and feed containing the sutterella wadsworthensis. Applied to animals, the sutterella wadsworthensis can be used for effectively developing an anti-inflammatory efficacy, so that the symptom of redness and swelling of joint is effectively improved and the symptom of arthritis is remarkably relieved and the sutterella wadsworthensis can be effectively used for treating or preventing rheumatoid arthritis or related diseases thereof.
