The invention provides a method for reducing the energy consumption of ferronickel production adopting an RKEF technology. According to the method, pre-reduced calcine with the content of ferrous oxide of 15-25% serves as early slags for smelting, and the content of the ferrous oxide in final slags is controlled to be 5-15% in the smelting process; the early slags comprise CaO, MgO, Al2O3, SiO2 and FeO; and in the early slags, the mass percentage of calcium oxide is 1-10%, the mass percentage of aluminum oxide is 2-10%, and the mass ratio of magnesium to silicon 0.5-0.7. according to the method, by means of reasonable selection, regulation and control of a laterite-nickel ore slag system, the reduction atmosphere is enhanced to selectively reduce iron oxide in the pre-reducing and smeltingprocesses, under the common regulation and control effect of different components of the slag system, the generation temperature of early slag liquid phase of laterite-nickel ore materials in an electric furnace is decreased, the generation speed is increased, the smelting temperature is decreased by 50-90 DEG C, and therefore the electricity consumption required for smelting the ferronickel canbe effectively reduced. The method has the advantages that the technological energy consumption of production of the ferronickel using the laterite-nickel ore and adopting RKEF technology can be remarkably reduced, and the production cost of the ferronickel can be lowered by 5-10%.