A parallelogram teaching demonstration device

Provided is a parallelogram teaching demonstration device which is a dedicated teaching aid. The dedicated teaching aid with a simple structure has a vivid visual effect when manipulated and is used for teaching the properties of a parallelogram. The parallelogram teaching demonstration device comprises a long batten (1), a short batten (2), a rubber band (3), and five wood screws (4). A large hole is disposed on the center of the short batten (2). Five small holes are disposed on the center of the long batten (1) and on the ends of the two battens. A central wood screw (4) is screwed into the central hole on the long batten (1) through the central hole on the short batten (2). The other four wood screws (4) are screwed into the end holes on the two battens. The rubber band (3) is sleeved along the outer edges of the four wood screws (4) in the end holes and thus the production of the parallelogram teaching demonstration device is completed. When the parallelogram teaching demonstration device is used, the in