Three-in-one optical fiber splitter box FTTH outdoor wall-mounted optical splitter box is used for the wiring connection between optical cable and optical communication equipment. Through the adapter in the wiring box, the optical signal is drawn out with the optical fiber jumper to realize the optical wiring function. . It is suitable for use after the FTTHI optical fiber cable reaches the building, and is installed in the corridor, basement, computer room and the outer wall of the building. The optical cable can also be spliced and drawn out with the household optical cable after being opened and coiled in the optical distribution box to realize the straight-through function of the optical cable and meet the needs of traditional transmission network engineering.