The invention relates to a circular seam type bottom-blowing gas supply brick, belongs to the technical field of metallurgy, and solves the problems that too large bottom blowing flow easily leads tothe erosion of refractory materials or a pipeline is easily blocked due to too large pressure loss in the prior art. The circular seam type bottom blowing gas supply brick comprises a main body and agas channel, wherein the gas channel comprises a circular seam type gas outlet pipe, a gas distribution chamber and a gas inlet pipe, the circular seam type gas outlet pipe comprises a central pipe, aplurality of outer sleeves and circular seams, and the circular seams are formed between the outer sleeves or between a outer sleeve and the central pipe. According to the circular seam type bottom blowing gas supply brick, the bottom-blowing gas can be adjusted in a large range, the bottom-blowing gas flow can be dispersed in streams while the bottom-blowing gas supply amount is increased, and the high efficiency and the long-service life of the bottom-blowing are finally realized.