The invention discloses a refractory castable for a desulfurization stirrer, which is prepared by mixing a castable base material and a proper amount of additives, wherein the castable base material comprises the following components in percentage by weight: 26-33% of sintered zirconium mullite, 26-35% of common fused mullite, 5-9% of flint clay, 4-7% of kyanite, 5-10% of superfine bauxite chamotte, 3-5% of fine silicon powder, 3-5% of fine alpha-Al2O3 powder, 5-8% of fine rho-Al2O3 powder, 1.5-3.5% of pure calcium aluminate cement and 1.5-3.5% of dense fine alundum powder. The additives comprise three or more of 1-2% of heat-proof steel fiber, 0-0.15% of polypropylene fiber, 0-0.5% of metallic aluminum powder, 0-0.3% of sodium tripolyphosphate and 0-0.5% of melamine based on the weight of the castable base material. The refractory castable has the advantages of good performance, low cost and wide sources of raw materials. Compared with the prior art, the refractory castable can enable the average service life of KR desulfurization stirrers to be improved by more than 100 times.