In order to improve the ultimate pressure bearing capacity and increase the volume of the cavity of the belt type ultra-high pressure die, a structure of winding discrete type large cavity ultra-high pressure die was proposed. This die is mainly composed of discreted cylinder, supporting ring and steel wire winding layers. The circumferential stress of the integral cylinder is eliminated in discrete structure and there is no need to use large size cemented carbide and supporting ring, which can effectively improve the pressure bearing capacity of high pressure die, reduce the difficulty of its manufacturing, and make it easy to obtain large cavity volume. The key parameters of the structure of high pressure die are designed and calculated to determine the optimal size of the geometry. It is found that under the same working internal pressure loading in numerical simulation, the stress of the discrete cylinder is lower, and the stress environment on the inner wall of the cylinder is effectively improved. The pressure bearing capacity of the winding discrete large-cavity ultra-high pressure die is predicted. It is found that the pressure bearing capacity of the die gradually increases with the increase of the number of discrete blocks, but the growth rate is slower and slower. Therefore, it is not feasible to increase the pressure bearing capacity of the cylinder by increasing the number of discrete blocks infinitely. The analysis shows that the winding discreted large cavity ultra-high pressure die has higher pressure bearing capacity, longer life and lower operating cost. It provides a new idea and method for the design of high pressure device with large volume and high pressure bearing capacity.