NOVELTY - A wind power main shaft is forged by heating steel ingot in furnace to forging temperature of 1240 plus minus 10 degrees C for more than 10 hours; taking out pre-forged blank, using upper and lower flat anvil for head end pressing jaw, transmitting jaw into upsetting drain hole, performing press panel strong upset forging, taking out the forged blank, clamping jaw, then using upper press plane and lower platform, performing upset forging to form wind power main shaft flange, heating to 1220 plus minus 10 degrees C and preserving heat for 3 hours; performing finish forging forming; and machining, hardening and tempering.    USE - Method for forging a wind power main shaft.    ADVANTAGE - The method is energy-saving, and has high efficiency, reduced cost and improved forging quality.    DETAILED DESCRIPTION - Forging a wind power main shaft comprises:    (A) taking electric furnace smelting, external refining and vacuum degassing steel ingot as raw material;    (B) heating the steel ingot in furnace to a forging temperature of 1240 plus minus 10 degrees C for more than 10 hours;    (C) taking out pre-forged blank, using upper and lower flat anvil for head end pressing jaw, transmitting the jaw into an upsetting drain hole, performing press panel strong upset forging, taking out the forged blank, clamping jaw, then using upper press plane and lower platform, performing upset forging to form wind power main shaft flange, heating to 1220 plus minus 10 degrees C and preserving heat for 3 hours;    (D) lifting a pre-forged T-shaped forge piece into a hollow rotating table, using the largest press forging pressure platform on the press with the flange end upset forging pressure, then using a pair of flanges anvil end rotary forging to forged piece size height, taking out forged material, clamping wind power shaft end on anvil, performing lower platform forging method of flange outer diameter for rolling, leveling, then clamping flange end, the anvil and the shaft body for forging forge piece size finish forging;    (E) cooling and re-crystallizing the workpiece and performing tempering heat treatment;    (F) carrying out rough machining; and    (G) hardening and tempering, performing non-destructive inspection, turning and packaging.