The invention relates the method for preparing chrome metal with microwave double wave controlled by computer. The method comprises the following steps: controlling purity of raw material, disintegrating, fine grinding, screening, mixing material, stirring, distributing, preheating furnace body, high temperature refining, nitrogen protection, cooling, purifying, and getting the high purity chrome metal whose purity is 95%, the chromium content being 63-75%, nitrogen content being 24-36%, using chromite powder as raw material, using common as reducing agent, using lime powder as fusing agent, using nitrogen as protective gas, adopting computer to control microwave double wave, using temperature probe to intake furnace body temperature information, using computer to control double furnace body smelting conversion, using microwave to heat, using LCD to display, fault alarming, and realizing the information, procedure and automation. The method has the advantages of high efficiency, short process flow and non environmental pollution.