This paper presented a physical representation for quantitatively simulating the motion of plant leaves, such as wilting and curling. The wilting motion is associated with the contraction and stretching of the plant cells. Fact based, our method modeled the physical morphological changes of the plant cells for describing the wilting motion of leaves. Firstly, a voxel mesh constructed based on 3D leaf model was used to simulate the cell structure of plant leaves. Then, the mass spring structure was applied to express the forces between cells .Finally, The Euler-Lagrange equation was utilized to model the movement process and solved by implicit newmark integration method to get the 3D positions of the voxel mesh. The movement trails of wilted leaf tip in the geometric space were used for data validation. The angular difference between measured motion direction and experimental results was 19°, and the distance between them ranged from 0.68cm to 3.0cm. The experimental data show that movement trails of wilted leaf tip that the method simulated is closed to the real wilted leaf; secondly, evaluating this method from the visual aspects, the algorithm also can realistically simulate the deformation process of plant leaf wilting.