This utility model relates to the field of fire-fighting equipment technology, and in particular to a quick-tightening strap structure for a fire helmet. It includes a first triangular strap, a second triangular strap symmetrically arranged on the left side of the first triangular strap, a
chin strap positioned between the lower ends of the first and second triangular straps, a
chin buckle movably mounted on the
chin strap, and a safety lock positioned between the right sides of the first triangular strap and the chin strap. This utility model scientifically and rationally improves the original fire helmet strap structure by incorporating a
metal buckle, a bent end, a
torsion spring pivot, and a pressure plate between the second triangular strap and the left end of the chin strap. This allows for convenient tightening or loosening of the chin strap during
helmet use, effectively reducing the
workload and difficulty of adjusting the chin strap, thereby improving the convenience and safety of the fire helmet in
actual use.