Buckle structure and construction site safety helmet

The utility model relates to the technical field of safety helmets, in particular to a buckle structure and a construction site safety helmet, the buckle structure comprises a helmet shell, a clamping sleeve, a cheek belt and a limiting assembly, adaptation boxes are symmetrically arranged on the two sides of the helmet shell, the clamping sleeve is movably arranged in the adaptation boxes through a springback assembly, and the cheek belt is inserted into the lower end of the clamping sleeve through a clamping assembly. The clamping assembly comprises a plug and two stabilizing rods, the limiting assemblies are arranged on the two sides of the adapting boxes, the adapting boxes are arranged on the two sides of the helmet shell respectively, then the lower cheek belt and the clamping sleeve are rapidly and stably connected through the clamping assembly, the connecting strength is high, and operation is convenient; in addition, the use tightness of the lower cheek belt can be conveniently and adaptively finely