The casting process of 2MW-5MW wind turbine hub casting was analyzed. The influence of different casting process methods on the quality of wind turbine hub casting was compared, and the advantages and disadvantages of different process schemes as well as the key points of process design schemes were analyzed. The results show that the main shaft hole is upward, the riser and chiller are used to balance the thickness, the filter system is designed in the pouring system, and the casting wall thickness can be reduced, cost reduced, efficiency increased, energy saving and emission reduction can be achieved by selecting the pouring system with large flow, low flow rate and no turbulence.