The invention relates to megawatt-degree wind power generation equipment, in particular a windwheel blade of megawatt-degree wind power generation equipment. The area near flange of blade root is transitional aerofoil form which relative thickness is between 90. 6% and 44. 3%, and between5. 33% and 16% of axial direction of blade; the Dutch DU series wind mill aerofoil used in blade root and positioning between 17. 65 % and 24. 88% of axial direction of blade has the relative thickness between 40% and 30%; and the Dutch DU series wind mill aerofoil used in blade centre and positioning between 36. 75% and 55. 33% of axial direction of blade has the relative thickness between 25% and 21%; the blade tip of blade is the USA aerial NACA6 series lamellar flow aerofoil form and its relative thickness is 18%. The blade in the invention has wider use range than the prior windwheel blade, it applies to Class II and Class III wind area, it has the advantages of high windwheel power and larger windwheel power under equal wind speed and so on. |