The invention provides a system for managing the energy efficiency of a power distribution network on the basis of reactive optimized coordination control. The system comprises a data acquiring layer, an area data converging layer and a main station layer, wherein the data acquiring layer consists of a plurality of pieces of terminal equipment, such as an integrated power distribution table area and a compensation device, and is used for acquiring the comprehensive electric quantity data and the working state of the public power distribution table area in real time; the area data converging layer is a plurality of data transmitting center substations which are established in a city or the other units; and the main station layer consists of a plurality of high-volume database servers, a disk array, a plurality of application servers, a WEB server, a plurality of working stations and an interface server. From the three aspects of grid capacity, technology and management, the system realizes power distribution network energy conservation estimation, energy efficiency monitoring and measurement, energy efficiency analysis, energy efficiency adjustment, new energy source access contribution rate estimation, and electric vehicle charging and discharging power station efficiency contribution rate estimation, and provides a basic supporting platform for energy conservation and emission reduction for countries and grid companies.