The invention discloses a method for evaluating investment benefits of power distribution network individual projects. The method comprises the following steps: step 1, establishing an individual project investment benefit index system, wherein indexes and corresponding index weights of the index system are a power distribution network planning index, an investment construction index and an investment benefit index as well as 0.3, 0.3 and 0.4 respectively; step 2, determining a score function of index scores, and adopting a secondary function as the score function, wherein the secondary function has a formula: y=ax<2>+bx+c; and step 3, computing individual project investment benefit evaluation scores, and arranging the scores from high to low according to an individual project investment priority. According to the method, the investment benefits of the power distribution network individual projects under construction and planned construction are predicted, the individual project investment priority is arranged according to values of evaluation scores, and a scientific basis is provided for investment decision-making.