The comprehensive assessment of power quality is essential for the implementation of effective power quality control and reasonable pricing in the power market environment. According to the characteristics of evaluation index, evaluation weight and evaluation model, this paper classifies and summarizes the research status of power quality comprehensive evaluation. On this basis, it summarizes the problems in existing methods including it cannot adapt to different application requirements, has not been evaluated long-term scales, has not considered the governance costs and economic benefits of the evaluation results comprehensively, and has less consideration of the integration of transient steady-state indicators. Finally, this paper points out that the evaluation method considering economic benefits, the comprehensive evaluation under DG grid-connected conditions, the data-driven power quality assessment and the comprehensive evaluation of energy internet power quality are the future research directions in this field. This work is supported by National Natural Science Foundation of China (No. 51777035) and Science and Technology Project of the Headquarter of State Grid Corporation of China (No. SGGR0000DLJS1800467).