The utility model relates to a power load monitoring system based on power load technique of decomposing, its technical characterstic are including voltage transformer, current transformer, intelligent electrical energy consumption analysis appearance, main control system and user terminal, voltage transformer and current transformer install in direct current system's main entrance department and are connected with intelligent electrical energy consumption analysis appearance, intelligence electrical energy consumption analysis appearance is connected with the main control system through the communication network, the main control system is connected with user terminal. The utility model discloses install in direct current system's main entrance department, carry out real -time supervision through voltage, electric current and active power to direct current system main entrance department, in the analysis direct current system each load kind, open and stop state, operational aspect and the power consumptive condition and can carry out power load monitoring and analysis under the condition of not invading user service environment.