The invention belongs to the technical field of power distribution network planning methods, and relates to a power distribution network project planning method based on power distribution unit comprehensive benefits. The method includes partitioning the power distribution units, establishing an evaluation system based on the power distribution units; converting the current situation level of eachindex uniformly into a score under a percentage system; constructing a fuzzy judgment matrix and assigning and calculating each weight coefficient; setting an interval coefficient, calculating a comprehensive adjustment score of the power distribution unit, and carrying out statistical sorting. According to the method, a power distribution network management enclosure is divided into a pluralityof power distribution units; a decision analysis and evaluation system is used for analysis, and the factors influencing the investment decision are analyzed from the two dimensions of the developmentlevel of the power distribution units and the input and output benefits of the power distribution units, the comprehensive adjustment coefficient is introduced to perform the final evaluation processing on the power distribution unit, so that the stock and increment of the power distribution unit can be considered, the mode of evaluating the investment income purely from the perspective of economic benefits in the past is changed, and the power distribution network planning effect is improved.