Novel steel structure air inlet window

The utility model belongs to the technical field of door and window equipment, and particularly discloses a novel steel structure air inlet window which comprises an outer frame installed on a wall, a plurality of blades, a round pin, a pulling mechanism and a plurality of pull rods. The blades are in a transverse long strip shape. The two ends of the bottom of each blade are hinged to the left and right sides of the outer frame through round pins correspondingly. The blades are connected with a pulling mechanism through a pull rod, the pulling mechanism comprises a connecting rod, a pulley, a hand winch and a pull rope, one end of the pull rod is hinged to the connecting rod, the upper end of the connecting rod is connected with one end of the pull rope, and the other end of the pull rope bypasses the pulley to be connected with the hand winch. The hand winch acts to tighten the pull rope to pull the connecting rod to move upwards, so that the pull rod drives the blades to rotate around the round pin, and th