Optionally combinable bookshelf

The utility model discloses an optionally combinable bookshelf which comprises frame plates. Left upper edges and right upper edges are arranged on the frame plates, a plurality of open slots are formed in the middles of the left upper edges and the middles of the right upper edges, the quantities of the open slots can be set according to the lengths of the frame plates, and distances among the corresponding open slots need to be equal to one another. An upper frame plate, a lower frame plate, a left frame plate and a right frame plate are perpendicularly connected with one another to form a frame, and the frame plates with different lengths can be combined with one another to form the various square or rectangular frames with different sizes. The open slots in each frame are aligned with the open slots on another frame, so that the various square or rectangular frames with the different sizes can be optionally combined with one another. The optionally combinable bookshelf has the advantages that the bookshel