The invention discloses a green environmentally-friendly method for smelting high-purity silicon. According to the method provided by the invention, most impurities in silicon mud can be effectively removed by using specific slag forming agents in combination with specific mixed gas blowing, and the high-purity silicon with purity of 99.999% or more can be obtained; and the method has low costs, is green, environmentally friendly and worthy for promotion and use, and facilitates development of a solar photovoltaic industry.