The invention provides a transformer substation automation equipment interoperation capability evaluation method and system, and the method comprises the steps: carrying out the dimension reduction processing of a graded evaluation index through employing a method combining the analytic hierarchy process and the principal component analysis, and obtaining a main evaluation function of the evaluation index; inputting the main evaluation function into a pre-established evaluation index model, and determining an evaluation element weight of the to-be-evaluated index; comprehensively evaluating the interoperation capability of the transformer substation equipment based on the evaluation factor weight; wherein the evaluation index model comprises a main evaluation function of the evaluation index after dimension reduction processing and a corresponding importance degree.