Abstract: An optical fiber interconnection mechanism has a casing frame and a plurality of housing units vertically stacked therein. Each of the housing units has a top plate, a bottom plate, two opposed side plates and a back plate with a plurality of fiber guide ring members. A protecting cover plate is removably mounted on the front of the corresponding housing. At least one optical terminal plate is arranged horizontally between the two opposed side plates and has a plurality of optical sockets for making connections with optical fibers. A plurality of excess fiber length storage plates are located at the rear of the terminal plate. A plurality of sets of radially arranged winding saddles are positioned on the storage plates for receiving the excess lengths of the fibers connected to the optical sockets.