In order to meet the requirements of first-season rice harvesting in China, aiming at the problems of lack of line-setting function and high crushing rate of first-season rice harvesting in China, an automatic line-setting system of crawler type regenerating rice combine harvester was designed based on the WoDE Triomorong 4LZ-3.0E rice harvester, and the key technologies of mechanical, hydraulic and electronic control were comprehensively used. When the system is applied in the wide and narrow row planting mode, it can ensure that the crawler of the harvester walks in the middle of the wide row to avoid rolling and leaving stubble on the recycled rice, which affects the second season yield of the recycled rice. The system is mainly composed of the row detection unit and the row control unit. The feasibility of the automatic steering control strategy is verified by establishing a mathematical model for the tracked vehicle. After performance verification, the system can automatically correct the line.