The invention relates to a method for making a vane of a wind-driven generator by adopting ultra-high strength polyethylene fiber composites, which is characterized in that the front edge, the girder rind, the upper shell and the lower shell of the vane are made from ultra-high strength polyethylene fiber fabrics and matrix resins through each component mould, the inner sides of the front edge, the upper shell and the lower shell of the vane are compounded and fixed with core materials with sandwich structures in the molding process, the girder rind of the vane and a honey core material are boned together into the girder of the vane by epoxy resins, a bonding rib is made of a foam material through a mould, the front edge and the girder of the vane are bonded by the epoxy resins to form the front-half component of the vane, the upper shell and the lower shell of the vane and the bonding rib are boned by the epoxy resins to form the back half component of the vane, and finally the frontand the back half components of the vane are boned by the epoxy resins to form an integrated vane which has the advantages of light weight and high strength. Therefore, the wind-driven generator adopting the vane made by using the method can start to generate in low wind speed, and can still keep the safety of a fan in high wind speed so as to enhance the stalling wind speed (wide adaptation range of the wind speed). The product of the invention has the advantages of stable quality, favorable performance, simple equipment and convenient production.