The utility model discloses a waterproof ventilation unit, a waterproof ventilation unit, including induced air watertight fittings and air -out device, induced air watertight fittings constitutes at the grid of front portion, waterproof box and the circular water leaking pipe of setting at the rear portion who sets up at the middle part by setting up, the air -out device comprises seal shell and the play tuber pipe of seamless connection on seal shell. The utility model provides a simple structure's a waterproof ventilation unit has realized not only ventilating but also waterproof, has also realized the solid stop motion bars facial height little while of degree and has realized the requirement that the ventilation pipe diameter is big again.