Agriculture is the fundamental pillar of economic development in the region. This study relies on experimental testing and biomechanical models to analyze the mechanism of soil mechanics properties on root growth and development processes, and systematically explores feasible paths for optimizing soil structure and improving cultivation and planting patterns through biomechanical methods. Empirical analysis shows that using biomechanical theory to regulate root soil interaction can effectively improve crop yield and resource utilization efficiency, not only achieving agricultural value-added, but also providing endogenous driving force for county-level economic development. Improving production efficiency through biomechanical agricultural technology not only plays an important supporting role in regional sustainable development, but also ensures the safe operation of rural economy. Agricultural biomechanics technology is an important path to construct a sustainable agricultural economic development model. Under policy guidance, biomechanical optimization schemes can further improve agricultural production methods, enhance agricultural management efficiency, and achieve dual benefits of long-term sustainable economic development and ecological protection.