The invention provides a method for the dephosphorization of phosphorized crude-nickel iron by refining; a dephosphorization agent of lime or limestone with 3 to 8 percent of the quality of the crude-nickel iron and flux fluorite with 0.5 to 3 percent of quality of the crude-nickel iron are added in the melt high sulfur crude-nickel iron in a middle-frequency induction furnace; under a high temperature, the dephosphorization agent and the flux are melt; the industrial oxygen or high pressure air with a pressure of 0.3 to 0.7MPa is blown into the flux in the furnace; top blowing and refining are carried out for 3 to 15 minutes under the condition of a temperature of 15000 to 1600 DEG C to lead the carbon thereof to be oxidized and carry out slagging after partial iron is led to be oxidizedwith the impurities like silicon and phosphor; after the refining is finished, the slag is removed to obtain the refined nickel iron; wherein, the phosphor, the carbon and the silicon are reduced to be below 0.015 percent; the quality of the nickel is improved to be above 15 percent; the direct yield of nickel is equal to or more than 95 percent. The method of the invention has a simple techniqueand low energy consumption; besides, the method of the invention is easy to realize industrial production.