The invention relates to a top air sealing device for optical fiber drawing. The top air sealing device is characterized by comprising a self-tightening spring, an annular bottom plate, graphite air sealing rings and an upper pressing ring; a high concave opening and a low concave opening are formed in the annular bottom plate from outside to inside in a sequence; a plurality of equant kerfs are arranged at an inner ring opening of each graphite air sealing ring along the circumference direction; a plurality of graphite air sealing rings are overlapped, and then the outer sides of the graphite air sealing rings are arranged on the high concave opening and compressed through the annular bottom plate; the self-tightening spring is arranged at the low concave opening at the lower side of the inner ring opening of each graphite air sealing ring. The top air sealing device for the optical fiber drawing has the advantages of simple structure, high reliability, convenient maintain and low cost.