Aiming at the problems existing in the extraction of plant leaf vein e dges,a leaf vein edge extraction method combining image fuzzy enhancement and improved Canny operator is proposed. Firstly,a piecewise fuzzy membership function is constructed to perform different processing on the high and low gray value regions.Then,the gray contrast of the adjacent areas of the leaf veins is enhanced by fuzzy enhancement function.Fina lly,the leaf vein edges of the enhanced image are extracted by the improved Canny operator.The improved Canny operator a daptively applies Gaussian filtering according to the mean difference between pixels and local pixels to reduce the s moothing effect of filtering on the edges.The Prewitt template is used to calculate the gradient magnitude and direction to re duce the effect of noise on the gradient calculation.The linear interpolation technique is used to realize omnidirection al non-maximal suppression,and the edge refinement is achieved more accurately.The experimental results show that PSNR of the method for extracting leaf vein edges under low illumination and uneven illumination are 51.1362dB and 50.2174dB,respectively.Compared with the traditional edge extraction method and related literatures,the method is not se nsitive to the boundary ambiguity,and it can more effectively extract complete l eaf vein edges.