The utility model relates to the technical field of metallurgy, in particular to a steel ladle bottom blowing air brick which comprises a breather pipe, a slit block, a dispersion block, a brick corebody and a brick core brick cup. The brick core body is arranged in the brick core pocket brick; the slit block is arranged at the bottom of the inner side of the brick core body, and a cavity is formed between the brick core body and the lower end face of the slit block. And slits which are uniformly distributed are formed in the slit block. The dispersion block is arranged in the brick core body, the lower end of the dispersion block is fixedly connected with the upper end of the slit block, and the upper end of the dispersion block penetrates through the brick core body and extends to the outside; a gas channel is formed in the dispersion block; castable is filled on the inner side of the brick core body and on the outer sides of the slit blocks and the dispersion blocks. And one end ofthe breather pipe is fixedly connected with the brick core brick cup and extends into the cavity. According to the steel ladle bottom blowing air brick provided by the embodiment of the utility model, steel grade modification and casting interruption of a casting machine are prevented, and the influence on the quality of molten steel and the normal production rhythm is prevented.