The invention discloses a well logging image equalization processing method based on dichotomy. Firstly, parameter setting is carried out. Then initialize the segmentation of the logging image, and then segment it automatically. The automatic segmentation is judged to be finished, the data value is mapped according to the automatically segmented data range, and the mapping result is outputted. Theinvention can automatically divide an infinite number of times by using a two-dividing method for a dividing range in which the distribution range of data values is uneven, that is, the number of data in the dividing range accounts for more than 1/256 of the total number of data. In order to achieve the uniform distribution of display effect, that is, all the display gray scale is used as effectively as possible, so as to significantly improve the resolution and contrast of the display. The processing flow of the invention is simple to operate, and is applied to the data processing of the well logging image to verify that the method has good processing effect.