The present invention is added to the high chromium-based cast iron with high chromium content, by removing the sulfur component and other gases in the solubility with a strong surface adsorption power, excellent wear resistance, heat resistance and corrosion resistance as well as toughness to improve toughness In order to provide a method for manufacturing a high chromium-based white cast iron alloy, C: 2.4 to 3.4%, Cr: 4.0 to 30.0%, Si: 0.30 to 0.82%, Mn: 0.30 to 0.90%, and P: A melt composition step of forming a high chromium-based white cast iron alloy melt composed of 0.05 or less and S: 0.07% or less and the balance of Fe; Melting temperature control step of maintaining the melt of the high chromium-based white cast iron alloy at 1550 ± 20 ℃; Preparation of inoculum to prepare an inoculum mixed with 1 to 18.8% rare earth metal, 2 to 24.5% K, 0.8 to 9.4% N and 0.8 to 47.3% Ca by weight percent Steps; The high chromium-based cast iron alloy is characterized in that the inoculant is administered to the inoculum to act as an alloying element by administering the inoculum in an amount of 0.2 to 3.0% by weight relative to the melt.
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