The invention discloses a greenhouse intelligent mobile robot vision navigation path identification method. Original image information is converted from an RGB color space to an HSI color space, H, S and I component information pictures are extracted respectively, the H component information picture is subjected to denoising processing, a K-means algorithm is used to carry out clustering segmentation on the H component information picture, and the segmentation effect picture of a road is obtained. A morphological erosion method is employed to carry out secondary denoising processing, the picture which is subjected to the erosion process is subjected to gray conversion, and the complete road information is obtained. The Candy operator edge detection is employed, edge discrete points are extracted, navigation discrete points are converted and acquired, the navigation discrete points are fitted to obtain final navigation path information which is subjected to coordinate transformation, and the navigation angle of a mobile robot is calculated. The robustness of navigation path identification to illumination inequality is effectively raised, the subsequent image processing operation is facilitated, and the rapid real-time performance of the whole path identification system is raised.