Plant leaf contour extraction technology is an important part of the field of plant image recognition. As plant image recognition plays an increasingly important role in scientific research and production, plant leaf image contour extraction technology will also usher in a period of development opportunities. Related research More and more abundant. We usually use a camera to take photos and then the staff identify the plant species. The identification of a large number of plant images has brought tremendous pressure to plant identification and classification personnel. If computer-aided processing and processing of plant images can be used, the objectivity and efficiency of classification will be greatly improved[1]. In this paper, the camera is often used to take photos of plants first, then go through grayscale, morphological processing, noise processing, edge detection, etc., and finally obtain the ideal leaf image through contour extraction.