During growth, crop stalks are prone to bending deformation, posing challenges for computer visualization simulation. This study employs a differential analysis method to investigate the physical stress-strain relationship of stalks. It proposes a visualization simulation method for flexible stalks. First, a mechanical model of the stalk under tensile, bending, shear, and torsional loads is established. Second, a geometric model based on a semi-structural approach and surface modeling is constructed. Finally, C++ and OpenGL are utilized to implement the visualization simulation. Experimental analysis of the bending stress-strain characteristics of stalks from different varieties is conducted. The results demonstrate that this method can relatively accurately simulate the deformation process of stalks. The physics-based model ensures the accuracy of bending simulation, providing a novel informatics analysis tool for selecting and breeding lodging-resistant crop varieties.