Abstract: The internal structure of the combine harvester is complex, and there are prominent problems such as the invisible internal structure in the process of practical teaching, and the inability to effectively explain and demonstrate the operation of relevant knowledge and skills, which seriously affects the teaching effect. The virtual simulation technology improves the shortcomings of traditional teaching, and makes the internal structure clearly presented by 3D modeling and visual reconstruction of the combine harvester, which effectively solves the problem of explaining the internal knowledge structure and skill operation demonstration of the combine harvester, and greatly improves the teaching effect. It provides a reference for the practical teaching of combine harvesting mechanism construction and maintenance and agricultural machinery related courses.