Electrical Steel Coils are punched and cut into certain shape and size in the production line, the classification and finishing work is completed at the end of the production line, and it is automatically stacked into 20 columns and used for the core assembly. The production line is used for shearing, O punching and V notch of transformer core sheet. The special point of this line is that two O punch and one V notch can work at the same time to produce transformer core pieces with 3, 5, 7 steps in vertical direction and 3, 5, 7 steps in horizontal direction. Any size and any length with and without Miter cutting can be achieved.