Abstract: The harvest mechanization of cereals is low, so it is suitable to harvest by stages. In this paper, on the basis of rice harvester, a small grain combine harvester and baler is developed. Through the analysis of the supporting device, the transverse conveying device and the bundling mechanism, the key parts such as the supporting finger, the conveying chain teeth and the bundling mechanism are analyzed and calculated, so as to ensure the adaptability and reliability of the combine harvester and baler for wheat and cereal crops.