Abstract: In the design and manufacturing process of tractor parts, in order to improve the design efficiency and optimize the processing process, it proposed a digital processing simulation method based on cloud platform and UG software. After using UG software to create a three-dimensional model, the processing process is simulated with the help of cloud platform’s high-efficiency computing capacity and sea capacity storage capacity to achieve the optimization of processing process. Taking the machining simulation of tractor parts base as an example, it called the cloud platform resource, and simulated the machining process of parts by UG software, and obtained the machining path and data of parts. It optimized the machining process according to the machining simulation results.