The invention provides a smelting method of low-carbon ferrosilicon. The smelting method includes the steps that compressed air and oxygen are introduced in a bottom blowing ladle of a submerged arc furnace; in the ferrosilicon tapping process, a mixed refined material A formed by mixing quartz sand, cryolite and iron cultured sand is ceaselessly added in, and adding is completed 3 min before discharging; after adding of the mixed refined material A is completed, the submerged arc furnace is subjected to hole plugging; after hole plugging, the submerged arc furnace is directly hoisted and transported by a crown block into a slag bath to be subjected to slag-off treatment, and after slag-off operation is completed, a mixed refined material B formed by mixing quartz sand, hematite and fluorite pellets is added. According to the smelting method of the low-carbon ferrosilicon, compressed air and oxygen are introduced in the bottom blowing ladle of the submerged arc furnace, carbide entering a hearth molten pool during smelting is reduced, the environment is not polluted, and the carbon reducing and impurity removing effect is good.