A damping unit for a film packing device a first roller, a damping roller and a second roller connected to the base of the film packing device respectively. The first roller includes a frame connected to the base and a first tube and a second tube are connected to the frame. The damping roller is located between the first and second rollers and has a spring biased on a top thereof so as to control its speed of rotation. The film goes partially around the first tube, the second tube, at least half of an outer periphery of the damping roller and then partially around the second roller before being wrapped around the object.