Rosmarinic acid (Rosmarinic acid, referred to as RosA) is a natural antioxidant with strong antioxidant activity, which helpsprevent cell damage caused by free radicals, thus reducing the risk of cancer and arteriosclerosis. Rosmarinic acid has strong anti-inflammatory activity, while rosmarinic acid also has antibacterial, antiviral and antitumor activities. At present,rosmarinic acid has shown its important application value in the fields of pharmaceutical, food and cosmetics.