The invention provides an electrical energy quality centralized monitoring and auxiliary management decision support system, which comprises a data layer, a site layer and an application layer, wherein the data layer and the site layer perform signal transmission mutually, and the application layer performs the signal transmission with the data layer. The electrical energy quality centralized monitoring and auxiliary management decision support system adopts targeted management measures and technical measures; by the system, the electrical energy quality management and the planning, design and construction and transform of an electric distribution network are fully operated, and power service level and power service quality are effectively improved.