Hydraulic rapid mold change is a fast and effective method of mold switching. Working principle: using pneumatic hydraulic pump unit to generate high oil pressure, hydraulic oil enters the oil circuit connected with the mold clamp, pushes the piston and lever mechanism of the mold clamp to work, and realizes fast clamping of the mold. Using the system pressure relief reflux to quickly release the mold clamp to realize fast unloading of the mold. Thus greatly shorten the mold switching time. This method can help enterprises quickly adapt to the multi-batch production mode, providing a complete solution for fixing, moving and replacing molds in the production process, and improving the rapid response ability of the production system. The rapid die change system is used in various injection molding machines, die casting machines, punches, hydraulic presses and other equipment, as well as automotive parts manufacturing, home appliance manufacturing, Marine industry and aerospace industry.