The invention relates to a subjective-and-objective mixed evaluation method for constructing a power system cloud platform. The method is characterized by comprising the following steps of1, analyzinginfluence factors for constructing the power system cloud platform, and constructing a power system cloud platform construction and evaluation index system; 2, solving an index weight value by meansof the subjective-and-objective mixed weight determining method in which a hierarchy analysis method and an entropy weight method are combined based on the power system cloud platform construction andevaluation index system which is established in the step 1, and establishing a subjective-and-objective mixed evaluation model for constructing the power system cloud platform; and 3, performing comprehensive evaluation on construction of the power system cloud platform, and obtaining a power system cloud platform construction evaluation valve F. According to the subjective-and-objective mixed evaluation method, the entropy weight method and the hierarchy analysis method are combined; the subjective-and-objective mixed weight determining method in which the hierarchy analysis method and an entropy weight method are combined is selected for solving the weight determining value; and defects of overhigh subjectivity of an expert option in a subjective weight determining method and overhigh randomness of measured data in a subjective weight determining method.