Manufacturing method for oriented silicon steel casting blank and casting blank system

The invention provides a manufacturing method for an oriented silicon steel casting blank and a casting blank system. The manufacturing method is used for conducting continuous casting treatment on refined molten steel. The continuous casting treatment comprises the following steps that solidification treatment is conducted to enable a part of the refined molten steel to be solidified to form a blank shell; and during solidification treatment, electromagnetic stirring is carried out to enable the residual molten steel after refining to finally form a casting blank, wherein a distance between the electromagnetic stirring position and an outlet of a crystallizer is 0.3-1.5m, and a current range of electromagnetic stirring is 0-900A. In the manufacturing method, the electromagnetic stirring intensity is adjusted by adjusting the electromagnetic stirring position and the current magnitude, then the generation amount of isometric crystals is adjusted through the electromagnetic stirring intensity, and a range of t