The utility model relates to an aluminum silicate fiber product used between a continuous casting ladle drain nozzle and a long nozzle in the steel industry, in particular to an aluminum silicate nozzle washer in the shape of a reversed cap, wherein the horizontal-direction diameter of the cap shade of the washer is slightly larger than that of a ladle sliding mechanism, and the inside diameter of the cap bucket of the washer is slightly larger than outside diameter of the ladle drain nozzle; the outside diameter of the cap bucket of the washer is slightly smaller than the inside diameter of the long nozzle, and the height of the cap bucket of the washer is slightly smaller than the height of the bowl mouth of the long nozzle. The nozzle washer is arranged between the ladle drain nozzle and the long nozzle, can isolate molten steel from contacting with air and can favorably prevent the secondary pollution of the molten steel. Meanwhile, the horizontal cap shade of the nozzle washer is arranged between and separates the ladle sliding mechanism and the middle ladle molten steel so as to reduce the influence of the back washing and the radiant heat of the middle ladle molten steel on the ladle sliding mechanism and improve the service life of the ladle sliding mechanism.