The invention discloses a L0 norm decomposition-based cartoon image enhancement and display method and system. The method comprises the following steps: decomposing input cartoon images into low-frequency images and high-frequency images by adopting L0 norm; enhancing the high-frequency images according to position information of the low-frequency images so as to obtain enhanced high-frequency images; and synthesizing the low-frequency images with the enhanced high-frequency images so as to obtain enhanced cartoon images. According to the method, the input cartoon images are decomposed into low-frequency images and high-frequency images by adopting the L0 norm; and compared with a method of Laplace second derivatives, the method more accords with the characteristics of the cartoon images, the details of the images can be detected more correctly, after the low-frequency images and the high-frequency images are separated, uniform processing is not carried out on the separated information, and the high-frequency images are enhanced according to the position information of the low-frequency images, so that the introduction of noise is decreased to a great extent. The method and system disclosed in the invention can be widely applied to the field of image processing.