The invention provides a novel structure for strengthening a seam allowance of a semi-steel light clamping tire. The novel structure comprises a flanging end, a filler strip and a cord fabric layer, wherein a bead core is arranged at the lowest end of the cord fabric layer; a rubber sheet is arranged between a sidewall and the cord fabric layer; the filler strip is arranged in the middle of the cord fabric layer and at the top of the bead core; the flanging end is the top end of the cord fabric layer after flanging; and the arrangement of rubber sheet is beneficial to reducing the heat generated when the tire generates large deformation due to high load, and can effectively accelerate the dissipation of the generated heat, thus ensuring that the seam allowance of the tire cannot come awayand generate swelling at an early stage due to heat accumulation under a high load condition. The tire with the structure provided by the invention is suitable for a high-load semi-steel light clamping tire, and can effectively improve the strength of the seam allowance and greatly reduce the problem of seam allowance swelling generated in a use process. This structure can replace an existing seamallowance strengthening structure, and can effectively reduce the cost.