The invention relates to a method for eliminating magnetic iron oxide furnace accretion produced in a copper sulfide concentrate pyrometallurgical process. The method is characterized in that a proper amount of scrap copper and quartz are put in a weld pool in the metallurgical process on the basis of a traditional technology, elementary substance copper in the scrap copper replaces FeS in fusant to generate Fe elementary substance, Fe reacts with magnetic iron oxide (main component of furnace accretion) in the weld pool to obtain FeO, the added quartz and the FeO generate fayalite slag and thereby the magnetic iron oxide can be eliminated. The technology can be implemented during smelting, converting, continual copper smelting or the clarification separation process of a slag and sulfide mixed fusant electric furnace. The invention has the advantages that the copper matte grade can be improved, the copper contained in slag is reduced, the furnace condition is improved and the superiority of the separation of copper and impurities in the scrap copper is realized.