This design is a four column hydraulic press. The main machine of the four column hydraulic press is mainly composed of upper beam, guide column, workbench, mobile beam, master cylinder, ejection cylinder, etc. The master cylinder can complete the actions of fast downward movement, slow pressurization, pressure holding delay, pressure relief reversing, fast return, and home stop; Ejecting cylinder can realize upward ejection, stop, downward retraction and home stop. The design host