The invention relates to an improved double-cylinder hand-pulling inflator shell. The improved double-cylinder hand-pulling inflator shell comprises an inflator body, an upper cover arranged on the inflator body, and a base arranged on the lower portion of the inflator body. A first upper hole and a second upper hole which allow a linkage pipe to penetrate are formed in the upper cover. The inflator body is internally partitioned into three independent spaces, namely the first inflation space, the second inflation space and the exhaust space. The exhaust space communicates with the exterior. Foot treading parts are arranged on the left side and the right side of the base. The improved double-cylinder hand-pulling inflator shell is characterized in that the inflator body and the base constitute an integrated part formed by one-time injection molding of low-density plastic; a sealing ring is arranged between the upper cover and the upper portion of the inflator body; and after a plurality of positioning screws sequentially penetrate through the upper cover and the inflator body, the upper cover and the inflator body are connected together. The improved double-cylinder hand-pulling inflator shell has the advantages that the weight is small, assembly is convenient, and air leakage is not liable to occur.