The invention relates to a method for determining the weight of an evaluation index of a rural power grid renovation and upgrading project. According to the method, first, the subjective weight is determined with an analytic hierarchy method; secondly, statistic analysis is performed on historical data of a rural power grid, and the objective weight is determined with a mean-variance method; finally, the subjective weight and the objective weight are integrated through multiplication, and the final index weight is determined. Not only are influences caused by subjective deviation avoided, but also the objective actual conditions can be fully reflected, and scientificity and accuracy of index weight assignment can be effectively improved.