The present invention provides an electromagnetic image blocking method based on the morphological method and the Meanshift algorithm. The method comprises: performing homomorphic filtering noise suppression of images, using the morphological method to process the images so as to allow the images to be easily perform Mean Shift cluster segmentation, calculating image roughness and pixel value mean deviation as the threshold parameter of the clustering algorithm, performing MS segmentation, determining whether the images after segmentation are the same signal area or not, and merging the images belonging to the same signal area. The method is subjected to simulation and experiment verification, and the result shows that the method can effectively and accurately perform image noise suppression and segmentation of multi-area and multi-frequency electromagnetic images.