In view of the lagging development of agricultural machinery in the red soil hilly and mountainous areas and the common problems such as broken gears and broken blades of rotary tillers during the tillage process, the front claws of the gryllotalpa orientalis were taken as the research object. Combined with agronomic requirements, a virtual model was constructed with the help of digital twin technology to conduct simulation analysis on the crawler self-propelled rotary tiller with the optimized cutter bionic to the front claws of the oriental mole cricket. A comprehensive solution for this automated equipment was proposed. Adhering to the concept of the integration of art and science in industrial design, taking light weight, high efficiency, reliability and applicability as the core principles, digital twins were utilized to achieve design optimization, and a small rotary tiller matching the crawler tractor was designed to meet the tillage needs of hilly terrain. The design, performance and function of the rotary knife were simulated and optimized, the materials and structure were improved to enhance durability, the power system was optimized to improve the operation performance, bringing new changes. This product has achieved the goals of automation, standardization, high efficiency and low cost to a good extent, improving the agricultural production efficiency in the red soil hilly areas, and has excellent application prospects and promotion value.