The utility model discloses an early warning temperature reduction safety helmet, which comprises a helmet body (1) and a helmet brim (2), and is characterized in that an electric fan (3) and a switch (4) are arranged under the helmet brim (2), the electric fan (3) and the switch (4) are connected through a conducting wire (5), the electric fan (3) is movably connected with the helmet brim (2), an included angle being 90 degrees to 270 degrees is formed between the electric fan (3) and the helmet brim (2), a battery (6) is fixedly arranged in the helmet body (1), the battery (6) is connected with the switch (4) through a conducting wire, and the front end in the helmet body (1) is provided with an electricity proximity warner (7). The early warning temperature reduction safety helmet has the advantages that the structure is simple, convenience and practicability are realized, the automatic warning can be realized, safety, reliability and heat radiation and temperature reduction effects are achieved, and the wearing feeling is comfortable.