A phyto-composition is described for the treatment of joint diseases that comprises: a) from 0.01% to 26% in weight of an extract of Curcuma longa (turmeric); b) from 30% to 80% in weight of an extract of Harpagophytum procumbens, (devil's claws); c) from 0.01% to 25% in weight of an extract of Filipendula ulmaria (meadowsweet); and d) from 7% to 35% in weight of oil of Oenothera biennis (onagra). Said phyto-composition being used in combination with a pharmaceutically acceptable vehicle in order to obtain a pharmaceutical composition useful in the treatment of joint diseases, particularly, rheumatoid arthritis and osteoarthritis.