Aluminum alloy building decoration device

The invention provides an aluminum alloy building decoration device which comprises a cylinder and further comprises a transmission device, a clamping device, a first spring, a first movable plate, a second movable plate, a movable column, a limiting plate, a mounting ring and an electromagnet. Limiting blocks are symmetrically and fixedly connected to one end of the cylinder along the center; the movable column is slidably connected to the interior of the cylinder; the surface of the movable column is sleeved with the first spring; the end, close to the limiting blocks, of the movable column is fixedly connected with the first movable plate; one end of the first spring is fixedly connected with the first movable plate; the other end of the first spring is fixedly connected with the cylinder; the first movable plate is slidably connected with the inner wall of the cylinder; and the end, away from the first movable plate, of the movable column is fixedly connected with the second movable plate. The aluminum al