The utility model provides a safety helmet, includes cap shell, cap hoop and lower jaw area. Be equipped with the light in cap shell front portion, the preceding shade of cap shell divide into two parts, be respectively the locking cap along with the activity shade. The locking cap be the inclined plane along and the leading edge locking cap edge as an organic whole with the cap shell, the trailing edge of activity shade both sides through revolving axle and activity shade articulated with the cap shell for with locking cap along incline cant tie's inclined plane of leading edge, the activity shade can be around revolving a rotation. Locate to be equipped with mosquito -proof worm device what light and cap shell were connected. Need come back when observing as the staff, through the shade that will move about make progress the rotation can, the shade that will move about after the observation puts down can. The mosquito can be by adhesion of mosquito -proof worm device or electrocution night, had effectually protected the staff, had reduced staff's intensity of labour.