The invention discloses a large board blanking system for a hydraulic press with a large table top. By the board blanking system, blanking force (reducing extent can reach 70%-80%) can be greatly reduced. The board blanking system is provided with a large spliced blanking die structure having a lower die with a wavy cutting edge, and is small in the blanking force, high in production efficiency, low in die manufacturing cost and long in service life, the operation environment noise is low, and quality of manufactured parts is good. In addition, a hydraulic cushioning device for an ultrathin jack is used below a blanking ejector plate of the die so as to further reduce impact force in a primary oil way of the hydraulic press. The upper die and the lower die are spliced by upper die sections and lower die sections respectively. The cutting edge of the lower die is observed as a wavy spline curve horizontally, and a cutting edge of an upper die is a cutting edge of an ordinary die. A waste suppressed blanking plate is arranged on the periphery of the upper die, and a suppressed blanking ejector plate is arranged at the center of the lower die and is connected with a hydraulic cushioning system below the suppressed blanking ejector plate.