To improve the agricultural mechanization rate，an entiretrack modular unmanned agricultural power chassis with reasonable cost and convenient maintenance was presented based on the structure of the traditional articulated mountain tractor drive train for the unstructured roads such as mountains and hills and the complex and diverse crop growth environment. Meanwhile, in order to improve the passing performance and stability performance, the structure and topology optimization analysis of the crawler walking device base frame and the driving wheel support of chassis walking system were carried out. Furtherly, the quickconnect device of the farm implements mounting module and the threepoint linkage with PTO were designed. The quickconnect device can be used to replace different attachments to achieve different operations of the whole machine to improve the utilization rate of the whole machine. The differential steering device with motor compensation power can realize insitu steering and improve the mobility of unmanned agricultural power chassis. Finally, the digital automation transformation was realized for the future intelligent manufacturing. 