Production method of ultra-low anisotropic non-oriented silicon steel for oversize generator

The invention discloses a production method of ultra-low anisotropic non-oriented silicon steel for an oversize generator. The production method comprises the steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into a plate blank, hot rolling, normalizing pickling, cold rolling, annealing, coating and finishing. Wherein the non-oriented electrical steel comprises the following components in percentage by weight: less than or equal to 0.003% of C, 2.80-3.60% of Si, 0.15-0.45% of Mn, less than or equal to 0.04% of P, 0.4-1.2% of Als, less than or equal to 0.002% of S and the balance of Fe and other inevitable impurities; a continuous annealing furnace is adopted for annealing, the annealing temperature of a heating section and a soaking section is controlled to be 860-1030 DEG C, the speed of the strip steel is 90-130 m/min, the unit tension of the strip steel at an inlet and an outlet of the annealing furnace is smaller than 2.5 N/mm < 2 >, and the unit ten