The invention relates to an aluminiferous casting material for blast furnace tapping and a preparation method thereof, belonging to the technical field of fire-proof material. The main raw materials of the casting material contain industrial corundum powder, Si powder, high-temperature pitch grain powder, alumina concrete or calcium aluminum concrete, Aplha-Al2O3 superfine powder, SiO2 superfine powder and metallic silicon powder. Sodium tripolyphosphate or sodium hexametaphosphate is used as dispersing agent. Explosion-proof organic fiber and aluminum ash are added to acquire the casting material for blast furnace tapping. The casting material can be used, after adding 4% to 6% of water and mixing in the casting material, molding the mixture by pouring into a mould for blast furnace tapping, naturally hardening, drying, de-molding, drying at a temperature of 85 DEG C to 700 DEG C and removing water by performing thermal treatment. The casting material has high blast furnace slag resistant property and usability. By adopting the components Al2O3, Al, SiO2, etc., in the aluminum ash instead of the aluminum material and siliceous material in the casting material for blast furnace tapping, the invention can efficiently lower the cost of the casting material and find a new way to comprehensively use aluminum ash.