Smoke exhaust valve

The utility model discloses a smoke exhaust valve which comprises a valve body, a gear box, a switch motor and smoke baffles, the gear box is installed at the upper end of the valve body, the switch motor is installed on the gear box, the three smoke baffles are installed on the inner side of the valve body, a main shaft is arranged on the smoke baffles, and the main shaft is connected with the switch motor. The upper end of the main shaft is connected with a gear set in the gearbox, the outer side of the valve body is wrapped with a water tank, circulating motors are installed on the end faces of the upper side and the lower side of the water tank, power shafts of the circulating motors extend into the water tank to be connected with turbine blades, and a blocking plate is installed in the center of the interior of the water tank. A through hole is formed between the baffle and the turbine blade, aluminum heat dissipation plates are installed on the two sides of the water tank, and a pressure release valve i