Abstract: In order to improve the design efficiency of agricultural machinery and shorten the design cycle, it applied the virtual prototype technology to the design optimization process of agricultural machinery products. It created various parts of agricultural machinery products by using SolidWorks software. It carried out the virtual assembly in the software, and obtained the virtual prototype. Based on the secondary development of SolidWork software, it introduced neural network intelligent algorithm in the process of finite element analysis of virtual prototype, which effectively improves the accuracy of simulation calculation. The use of virtual prototype provides more basis for the optimization design of agricultural machinery products.