The utility model discloses a reducing temperature of heatstroke prevention safety helmet, including the cap body, air distribution tube and control box, be provided with the vent on the cap body, thevent internal fixation has the hair -dryer, the inlet end of hair -dryer leads to the outside of the cap body, the end of giving vent to anger of hair -dryer accesss to the inboard of the cap body, air distribution tube with the end of giving vent to anger of hair -dryer is connected, air distribution tube along the inside wall of the cap body is the round and distributes, evenly be provided witha plurality of blow hole on the lateral wall of air distribution tube's downside, blow hole's orientation with is the tangent plane of the inside wall of the cap body 0 30 the contained angle, the control box sets up the outside of the cap body, be provided with battery and control switch in the control box. The utility model discloses an air that reducing temperature of heatstroke prevention safety helmet can prevent to blow in in the safety helmet directly blows the head to the staff, does not influence the cooling heat transfer in the safety helmet simultaneously.