Abstract: Against the background of the gradually increasing proportion of new energy in microgrids, an integrated energy management method for light-fire-aluminum isolated microgrids with multiple time scales is proposed to address the problem of limited regulation capability of thermal power units in isolated microgrid systems containing electrolytic aluminum loads and the difficulty of new energy consumption. On the basis of the participation of the aluminum load in demand response, the dispatch model of the aluminum load is studied, and the carbon emission model of the aluminum load and the thermal unit in the isolated island microgrid system is analyzed based on the carbon tax policy. Finally, a low carbon economic dispatch model of the isolated island microgrid containing photovoltaic unit, thermal unit and electroytic aluminum load at multiple time scales is established. The simulation analysis is carried out with the example of a 9-node isolated island microgrid system to verify that the method can significantly improve the energy consumption of isolated island microgrids. The method can significantly improve the ability of the isolated island microgrid system to consume PV and make the system operate in a low-carbon and economic way.