The fiber optical splice closure belongs to a mechanical pressure sealing joint system, which is a protection device that provides optical, sealing and mechanical strength continuity between adjacent optical cables. The closure body is made of reinforced plastic with high strength and corrosion resistance. It is suitable for the connection in the terminal room of the structural optical cable, with mature structure, reliable sealing and convenient construction. It is one of the most commonly used equipment for user access points. It is mainly used for the outdoor connection of wiring optical cables and household line optical cables, and can be installed with box-type or simple-type optical splitters according to the needs of FTTX access. Widely used in communications, network systems, CATV cable television, optical cable network systems, etc.