Punching device for light steel keel connecting piece

The utility model relates to the technical field of building material accessory machining, and discloses a light steel keel connecting piece punching device which comprises a box body, a fixing plate is fixedly installed at the bottom of an inner cavity of the box body, fixing shafts are rotationally installed on the two sides of the top of the fixing plate respectively, half gears are fixedly installed on the outer surfaces of the two fixing shafts respectively, and the half gears are connected with the box body. According to the light steel keel connecting piece punching device, an electric telescopic rod is matched with a two-way rack and the half gears to drive the first connecting blocks to rotate towards the middle, the two half gears are arranged on the two sides of the two half gears, and the two ends of the two half gears away from each other are fixedly provided with first connecting blocks; and in the process that the first connecting block rotates towards the middle, the second connecting block dr