The invention discloses a novel manufacturing technology of large-sized carburized bearing steel G20Cr2Ni4A for wind electricity. The novel manufacturing technology comprises steel-making (based on an electric furnace), external refining (LF to VD), die casting (based on an electrode stick with the diameter phi of 700mm), electroslag remelting (in a protective atmosphere), forging (based on a 3500t fast forging machine), heat treatment, straightening and polishing. Through strict control of residual elements of original ingredients, molten steel purity is guaranteed, and through the electroslag furnace in the protective atmosphere and high control of Al content, oxygen is not increased in the electroslag process. Through control of chemical components, components of the remolten electrode bar are qualified. Through an electrode Al high-control technology, finished product Al content is controlled, and through a pier drawing technology and post-forge air cooling, large bar grain size requirements are satisfied. Through two-stage annealing and control of a furnace cooling rate, hydrogen removal and white point elimination are realized. The novel manufacturing technology realizes high purity and low oxygen content and solves the quality problems of large crystal grain sizes and white points.