Fire-fighting smoke exhaust valve for adjusting air outlet of pipeline

The utility model relates to the technical field of smoke exhaust valves, in particular to a fire-fighting smoke exhaust valve for adjusting an air outlet of a pipeline. According to the technical scheme, a blade is rotationally installed in a valve body, rotating shafts are arranged at the two ends of the blade, a transmission gear is slidably installed on the rotating shaft at the top end of the blade, and an electromagnet is installed at the end, away from the blade, of the rotating shaft at the top end of the blade; a supporting roller is installed at the position, located at one side of the transmission gear, of the top end of the valve body, the supporting roller is sleeved with a synchronous belt, a driving gear is installed on the side, away from the transmission gear, of the synchronous belt, the transmission gear and the driving gear are in transmission connection through the synchronous belt, and the driving gear is in transmission connection with a motor. A controller is installed on the valve bod