The invention discloses an annular area binary image processing method and a device, and the method comprises the steps: determining the midpoint of an annular area according to the image features, and determining the inner ring radius and outer ring radius of the annular area according to different proportions; according to the determined inner ring radius and the determined outer ring radius ofthe annular area, performing annular area gray scale information extraction on the image; performing binarization processing on each annular region, and setting an independent threshold value for eachannular region, so that the annular regions do not influence each other; and finally, splicing the binarization processing result of each annular region into the same image to obtain a processed clear image. The annular area binary image processing method and the annular area binary image processing device aim at a blurred image with obvious central radial characteristics or an image with non-uniform brightness, wherein the central illumination intensity of the image is higher than the edge illumination intensity.