NOVELTY - A wind power flange forming method involves heating steel furnace to 1300 degrees C, adding steel raw materials including carbon, silicon, manganese, sulfur and iron, casting resultant steel billet, heating and cooling the obtained cast and forging. The forged blank plate is heated to 1250 degrees C, followed by maintaining temperature for 1 hour, processing the forged forge piece to wind power flange workpiece corresponding to the specification by numerical control diameter-axial ring rolls, destressing the wind power flange workpiece, and heating resultant product at 550 degrees C for 5 hours.    USE - Method for forming wind power flange.    ADVANTAGE - The method enables forming wind power flange with high strength, toughness and impact resistance.    DETAILED DESCRIPTION - A wind power flange forming method involves heating steel furnace to 1300 degrees C, adding steel raw materials including (in wt.%) carbon (0.25-0.60), silicon (0.35-0.50), manganese (1.2-1.70), phosphorus (0.015-0.025), sulfur (0.012-0.02), chromium (0.30-0.80), molybdenum (0.10-0.30), vanadium (0.15-0.30), nickel (0.30-0.50), copper (0.15-0.3), nitrogen (0.015-0.05), titanium ( less than or equal to 0.2), niobium ( less than or equal to 0.06) and remainder of iron, casting resultant steel billet to 700 mm, heating and cooling the obtained cast, forging at 1150-1250 degrees C at forging ratio of 4 or 5 times, and increasing forging temperature to 780-800 degrees C. The forged blank plate is heated to 1250 degrees C, followed by maintaining temperature for 1 hour, processing the forged forge piece to wind power flange workpiece corresponding to the specification by numerical control diameter-axial ring rolls, destressing the wind power flange workpiece, and heating resultant product at 550 degrees C for 5 hours. The resultant product is processed on upper, lower surface and internal and external circle surface of wind power flange by lathe, cutting at 8 mm deep at cutting speed of 50 m/minute, processing on upper, lower surface and internal and external circle surface of wind power flange by lathe, cutting at 1 mm deep at cutting speed of 100 m/minute to obtain finished product.