The invention belongs to the field of food, and discloses a composition for preventing or treating joint diseases. The composition is mainly prepared from the following raw materials: zaocys dhumnade,eucommia flower, pawpaw, coix lacryma-jobi, pseudo-ginseng, beautiful millettia root, ginseng, cartilage, sugar and peptide. The prepared composition taking zaocys dhumnade, eucommia flower, coix lacryma-jobi, pawpaw, pseudo-ginseng, beautiful millettia root and ginseng as raw materials integrally has the effects of strengthening tendons and activating collaterals, expelling wind-damp and relieving arthralgia, tonifying liver and kidney and strengthening tendons and bones; shark cartilage powder, chitosan oligosaccharide and bovine bone collagen peptide are adopted for matching to lubricate joints. The composition has a good prevention or treatment effect on joint diseases, especially joint diseases caused by knee joint degenerative changes, can effectively improve symptoms such as ankylosis and aching pain, and has no side effect after long-term administration.