Safety helmet

The utility model relates to the technical field of safety operation equipment, and particularly discloses a safety helmet. According to the safety helmet provided by the utility model, the helmet outer surface layer of the helmet body is made of the metal material, compared with a helmet made of high-density polyethylene, ABS (Acrylonitrile Butadiene Styrene) and the like in the prior art, the safety helmet has a good reflection effect corresponding to electromagnetic waves of a millimeter-wave radar, and meanwhile, the plurality of triangular conical pits are formed in the surface of the helmet outer surface layer; when electromagnetic waves of the millimeter-wave radar irradiate the triangular conical pit on the safety helmet, the electromagnetic waves enter the surface of the pit in parallel, then are refracted on the pit and return in parallel to incident waves, the scattering sectional area of the millimeter-wave radar is increased, the contrast ratio of energy of a target wearing the helmet and backgro