Abstract: In order to improve the efficiency of agricultural machinery modeling and appearance design and improve the appearance art design effect of agricultural machinery products, the 3 D digital art design technology is introduced into the tractor appearance and appearance design process, and the 3 D model is designed with Maya software, the model is rendered and decorated with the materials provided by the software, and the 3 D modeling and art effect are designed. Taking the modeling and appearance design of the tractor engine cover plate as an example, the three-dimensional modeling and appearance design of the cover plate are carried out, and a better artistic effect is designed, which provides a new method for the research of the tractor modeling and appearance.