Roof throat opening opening and closing type ventilation skylight

The roof throat opening and closing type ventilation skylight comprises two bearing beams installed on the two sides of an air outlet of a roof, a supporting frame is arranged between the two bearing beams, valve plates are symmetrically arranged on the upper surface of the supporting frame, the valve plates on the two sides are jointly hinged to a supporting shaft in the middle of the supporting frame, and the valve plates on the two sides can seal the air outlet. A plurality of n-shaped frameworks are arranged between the upper ends of the two bearing beams at equal intervals, and a valve plate driving mechanism is arranged in the middle of a cross beam of each n-shaped framework. An inverted-V-shaped frame body is arranged between the upper portions of the n-shaped framework, a rain baffle covers the middle of the inverted-V-shaped frame body, an arc-shaped framework is connected to the outer side of the inverted-V-shaped frame body, a layer of thin plate bodies covers the arc-shaped framework, an air outl