The invention discloses a preparation method of a drossing equipment castable, and belongs to the technical field of slag-iron separation equipment in the blast furnace tapping process.The method comprises the steps that 1, refractory aggregates are prepared; 2, a binding agent is prepared; 3, the binding agent prepared in the second step is added into a mixer in the first step, wherein the mass of the binding agent is 6%-8% of that of the refractory aggregates, the binding agent and the refractory aggregates are mixed to be uniform, and the drossing equipment castable is obtained.According to the prepared drossing equipment castable, by means of creative component proportioning, the drossing equipment prepared through baking has good abrasion resistance, thermal shock resistance and erosion resistance, the service life of the drossing equipment is about 50 days under the situation that the drossing equipment is not repaired, the service life of the drossing equipment is greatly prolonged, it is better guaranteed that a blast furnace is stable in furnace condition and smooth in operation, and the production cost of iron and steel enterprises is reduced.