The invention discloses a combined optical cable distribution cabinet, which comprises upper and lower plates (2), left and right side plates (3), a rear plate (4) and a doorframe (5), wherein every two adjacent and vertical components among the six components are fixed by a matched fastening piece. A door (7) is hinged on the doorframe (5); a lock is arranged between the door (7) and the doorframe (5); each set of fastening pieces comprise a bolt, a fixing base (9) with a threaded hole and a mounting base (10) with a groove (11) or hole corresponding to the threaded hole; and the bolt passesthrough the groove (11) or hole of the mounting base (10) to be screwed with the threaded hole of the fixing base (9). The combined optical cable distribution cabinet is convenient to assemble and islow in manufacturing cost.