The technical problem to be solved by the utility model steel roof ridge vent is to provide a streamlined natural ventilator, which has good overall rigidity, light weight, light weight, flexible layout, and convenient maintenance. It is suitable for all kinds of large modern industrial plants, especially for lighting and ventilation requirements. Ridge ventilator's material and its performance: The ridge ventilator includs galvanized sheet, which is formed into an integral air floor frame through compression molding. Both ends of the smoke vent rooflight frame are U-shaped, and the U-shaped openings are arranged oppositely. The lower end of the smoke vent rooflight frame is a vertical downward air column. The skylight column is formed into one body; the inner cavity of the integral skylight frame is provided with steel plate profiled stiffeners. The streamlined natural ventilator window sash frame is made of aluminum alloy profile, the yield strength is 110N/mm2, the tensile strength is 160N/mm2, the hardness HV is not less than 58, and the wall thickness is 1.4mm. When the utility model is installed parallel to the roof, the wind pressure and strong wind invasion can be reduced; the integral molding makes the appearance beautiful and the integrity is excellent.