The precision blanking experiments of non-oriented silicon steel sheets with the thickness of 0.3 mm were conducted under different blanking clearances (10, 20 and 30 μm) and blanking rates (0.1, 1, 10 and 100 mm·s-1), and the macro and micro multi-scale structural features such as the length of each part of the fracture cross-section, surface roughness and grain orientations for the blanked fracture of non-oriented silicon steel sheets were quantitatively analyzed by confocal microscopy, scanning electron microscopy and electron backscatter diffraction. Then, the influence laws of blanking clearances and blanking rates on the blanking formability and blanking forming quality of the non-oriented silicon steel sheets were studied, and an evaluation model combining the variation coefficient and the technique for order of preference by similarity to ideal solution (TOPSIS) was proposed to comprehensively assess the influence of blanking process parameters on the quality of precision blanked products for non-oriented silicon steel sheets with the thickness of 0.3 mm, which provides important theoretical guidance for optimizing the blanking process and has significant importance for improving the manufacturing quality of critical components for advanced electric motors.