The invention belongs to the technical field of color blindness correction, and discloses a color blindness correction method based on regional mapping. The method comprises the following steps: getting the ratio (ratio 1) of the number of pixels meeting the condition that R>G to the number of pixels meeting the condition that R<=G; getting the ratio (ratio 2) of the number of pixels meeting the condition that R+G<255 to the number of pixels meeting the condition that R+G>=255; and mapping colors meeting the condition that R=255 to a part II, mapping colors meeting the condition that R>=G and R+G>=255 to a part III, mapping colors meeting the condition that R>G and R+G<255 to a part IV, and keeping the components R and G unchanged. Experiments show that color blind patients can well identify processed images. Moreover, the method of the invention is superior to other existing color blindness correction algorithms in efficiency, and the computing performance basically meets the requirement of real-time processing.