Optical cable junction box, also known as optical cable junction box and gun barrel, is the place where the end of optical cable is connected. Then it is connected to optical switch through optical fiber jumper to prevent material aging caused by heat, cold, light, oxygen and microorganisms in nature. It also has excellent mechanical strength. The solid shell and main structure of optical cable junction box can endure the worst environmental changes, and play a flame retardant role at the same time. Waterproof effect, so that vibration, impact, cable tension, twist and so on are protected.