Optical disc and cover plate thereof

The utility model provides an optical disc and a cover plate thereof. One surface of the optical disc is a reading surface; the other surface of the optical disc is a printing surface; wherein a central hole is formed in the center of the optical disc, a clamping area is arranged between the reading surface and the edge of the optical disc at a distance from the central hole to the edge of the optical disc, a first protruding part is arranged at the position, adjacent to the central hole, of the clamping area, and a second protruding part is arranged at the position, opposite to the first protruding part, of the printing surface. In addition, the size of a cover plate is similar to that of the optical disc, a through hole is formed in the center of the cover plate, and a third protruding part is arranged on one face of the cover plate. When a plurality of optical disc packages are stacked between the two cover plates, gaps are formed between the cover plates and the optical discs by the aid of mutual overlapp