The present invention relates to a method for reusing an iron-containing by-product and an apparatus therefor and, more specifically, to a method for reusing an iron-containing by-product, comprising the steps of forming a briquette by mixing an iron-containing by-product with 5-20 parts by weight of carbon per 100 parts by weight of the iron-containing by-product, pre-reducing the briquette at 800-1300°C, and charging the pre-reduced briquette into an electric furnace, and to an apparatus for reusing an iron-containing by-product, comprising a reducing furnace for pre-reducing, at 800-1300°C, a briquette formed by mixing an iron-containing by-product with 5-20 parts by weight of carbon per 100 parts by weight of the iron-containing by-product, and an electric furnace into which the pre-reduced briquette is charged.
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