Abstract: Airfoil sail has become the development trend of promoting buoyancy, reducing resistance and improving wind energy utilization. Composite materials have become the preferred material for airfoil sails because of their lightweight, corrosion resistance and fatigue resistance. Here is introduced the characteristics and properties of marine composite airfoil sail, expounds the development process and application status of composite airfoil sail at home and abroad, and is put forward the key technical problems and prospects of large composite airfoil sail.