The invention relates to a method for smelting silicon steel. The method comprises the following steps: converter smelting, external smelting and vacuum furnace smelting. In the method for smelting silicon steel, the converter smelting adopts the way of controlling the steel slag amount and adjusting the alkalinity of steel slag to ensure that the content of iron oxide is below 5 percent; the weight content of iron oxide is reduced below 1.5 percent after the silicon steel is smelted through an LF (ladle furnace); and the content of iron oxide in steel liquid is zero basically after the silicon steel is smelted through an RH vacuum furnace. The method can guarantee a continuous casting machine to roll steel billet normally and avoid the phenomenon of blockade at the water gap of a crystallizer.