The utility model provides a bleed-out-prevention ladle-bottom-blowing one-piece air brick, which is characterized in that: firstly, a steel jacket is wrapped around the tail of a brick core only and no steel jacket and fire clay are employed for the upper portion; and secondly, a conical surface portion or the whole conical surface of the brick core is designed into the shape of a projecting ring, and then the one-piece air brick is molded through casting. The routes for molten steel flowing out between the brick core and a brick cup are increased and accidents of bleed-out caused by sinking of the air brick core and blow-out of the brick core in the later period of use are reduced. The risk of bleed-out of the ladle one-piece air brick is lowered effectively.