The invention discloses an iron adding process-based medium-high silicon molten iron desilication method, and belongs to the technical field of molten iron pretreatment. The process of adding molten iron into a molten iron ladle by utilizing an iron mixing furnace/vehicle serves as molten iron desilication reaction time in a melting furnace; the potential energy of iron molten serves as stirring power of the melting furnace. A solid oxidizer and a slag-regulating agent in the same proportion as that of the iron flow of the iron mixing furnace/vehicle are added continuously to realize high-efficiency desilication. The method has the advantages that the burden of high-silicon molten iron in converter smelting is lightened; the cost of steel smelting is reduced; moreover, the process is simple; the operability is high; the equipment investment is low; the operating cost is low.