Preparation method of manganese-silicon alloy

The invention discloses a preparation method of a manganese-silicon alloy. The preparation method of the manganese-silicon alloy comprises the following steps of 1, adding first mixed ore into an electric furnace, adding second mixed ore into the electric furnace through a central feed pipe located on the top of the electric furnace, adding coke and silica into the electric furnace, and smelting the first mixed ore and the second mixed ore at a temperature of 1400 to 1600 DEG C to obtain manganese-silicon alloy-containing melt, and 2, separating the manganese-silicon alloy from the manganese-silicon alloy-containing melt, wherein the first mixed ore comprises 6.55 wt% of ferromanganese; the second mixed ore comprises 9.47 wt% of ferromanganese; and the manganese-silicon alloy comprises 65wt% of manganese, 14.43 wt% of iron, 18 wt% of silicon, 0.23 wt% of phosphor, 1.8 wt% of carbon and 0.04 wt% of sulfur. In the embodiment of the invention, the second mixed ore having high ferromanganese content is added into the first mixed for smelting, so that manganese content of the manganese-silicon alloy is improved fast and product quality can reach the standard at a product production date.