The utility model relates to a power safety helmet, which comprises a helmet body and a protective layer which is arranged in the helmet body, wherein the protective layer is provided with a plurality of air holes, and a temperature control device is arranged between the protective layer and the inner wall of the helmet body, and comprises a power supply, a polarity reversing switch and a refrigeration and heating module which are orderly connected. The power safety helmet is simple in structure and convenient to use, enables workers to control the temperature control device according to own demands to complete refrigeration and heating switching, and creates a suitable work temperature.