The starting process of the controller of the shearing machine is as follows: the start button is pressed, the contactor coil controlling the motor is energized, the three-phase asynchronous electric idea starts working, the feeding mechanism E pushes the plate C to the right, when the plate touches the SQ1 limit switch on the right, the three-phase asynchronous electric idea stops working and the plate stops moving. At this time, the electromagnet YA1 of the hydraulic cylinder controlling the drop of the press is electrized. The upper limit switch SQ2 of the press is closed, and the start of the press is lowered. When the lower limit switch SQ3 is encountered, the press will press the plate. Then, the electromagnet YA3 gets electricity, control the switch SQ4 of the cutter lifting to close, the cutter drops, treat the shear plate cutting, reach the predetermined position, the plate cutting end; The hydraulic cylinder electromagnet YA4, which controls the lifting of the cutter, is energized. The cutter rises and returns to the initial position. When SQ4 upper limit switch is encountered, it stops rising. After resetting the tool, electromagnet YA2 controls the pressing block to reset and rise to the initial position. Through the photoelectric detection switch to detect whether the shear plate has been removed, assuming that the removal, start the next round of new cutting, assuming that no, the shear machine will continue to be in a waiting state, until the plate is removed, can start a new work.