Preparation method of silicon-manganese alloy

The invention discloses a silicon-manganese alloy preparation method which specifically comprises the following steps: preheating raw materials, precisely proportioning, mixing the raw materials, conveying the mixed raw materials into a reaction furnace, igniting an initiator, and smelting the silicon-manganese alloy by utilizing high temperature initiated by the initiator. And after smelting is completed, cooling, separating and post-processing are conducted, and preparation of the silicon-manganese alloy is completed. The heat in the smelting process comes from the heat generated by igniting the initiator, and electric power is not used as energy, so that the electric power cost in the production process is greatly reduced; meanwhile, an electric furnace which is large in size and complex in structure is not used as a reaction container, and production equipment and site investment are reduced. In addition, the manganese recovery rate can be increased, and meanwhile, the mass fraction of elements such as ca