The invention discloses a comprehensive evaluation system for evaluating a power supply service level. The comprehensive evaluation system comprises a factor management module, an evaluation data management module, an evaluation execution module, an evaluation result analysis module and an evaluation result application module which are in data communication connection in sequence. According to theinvention, a normalized power supply service level comprehensive evaluation system of a service quality evaluation, supervision and control mechanism is established; data among different service systems are collected, association linkage analysis of big data is realized among the data, and requirements of different evaluation periods are met by establishing a power supply service comprehensive evaluation system, adopting day weeks for event notification, adopting monthly quarters for stage evaluation and adopting yearly comprehensive evaluation. The method effectively solves the problems of management pain points and evaluation deviation at present, timely finds and processes the defects influencing the service, can continuously and scientifically optimize and adjust the content of an evaluation system, and improves the service evaluation precision.