Calculation method for local bending characteristic of plant leaf

The invention relates to a method for calculating local bending characteristics of a plant leaf. The method comprises the following steps: fixing the joint of a petiole of a plant leaf and a plant stem, shooting an image of an unloaded state of the plant leaf and an image of the plant leaf subjected to bending deformation, applying a load to the tip of the plant leaf, and requiring that the contour and deflection characteristics of the bending deformation of the plant leaf can be clearly seen in the image. Selecting a section of which the contribution degree information is to be acquired, determining the length and the position of the selected section, and finding a curve section representing the same section on the two deflection curves; determining coordinates and vectors of the key points, calculating the diagonal direction and the tangential direction of each key point on each deflection curve, rotating and smoothly connecting each section of vector, and approximately calculating the contribution degree.