Abstract: Power system data analysis is a key factor that affects the stable operation of the power system.In the actual operation process, the evaluation results of the power system hierarchical network security risk quantitative assessment method are different from the actual security threat situation changes, leading to the accuracy of the power system security risk quantitative assessment Therefore, this paper proposes a hierarchical network security risk quantitative assessment method based on the PFWA operator.First, build a hierarchical network security risk assessment index system for power systems, explore the causes and evaluation criteria of hierarchical network security risks in the power system, and analyze security information attributes; secondly, introduce PFWA operators, provide quantitative behavior expected value theory, and calculate hierarchical levels Matrix, accurately locate the network security risk results; finally, quantify the network security risk value, and sort the risks of different stages of the power system, realize the quantitative assessment of the power hierarchical network security risk, and ensure the basic safety of the power system network environment.The experimental results show that the evaluation results of this paper have a small deviation from the actual changes, which can effectively improve the accuracy of the quantitative evaluation of power system network security risks.