The invention discloses an optical communication box which is convenient for capacity expansion and reconstruction, comprising a first box body, a base, a stand, a 12-core melting and matching integrated tray, optical cable fixing lugs, a fiber winding tube, a fiber winding tube cover plate, and an optical cable Steel wire fastening seat, perforation, fastening bolt, chute, installation box, threaded rod, runner, sleeve, slave helical gear, main helical gear, rotating shaft and base door, one side of the first box moves through a hinge A box door is installed, a recording box is installed inside the box door, and a chute is provided on the top of the first box body; the present invention can classify and fix the optical fibers through multiple mechanisms, which is convenient for later maintenance, statistics and transformation; at the same time, through There are multiple mooring devices designed on the structure of the mooring device bracket, which is convenient for the temporary parking and protection of unopened business optical fibers, and at the same time clearly judges the opening of the service; at the same time, the internal volume is expanded by stretching the first box and the second box, which is fast and convenient The completion of the expansion transformation is convenient for practical application.