The structural parts are made of thickened galvanised passivated cold rolled steel plate and performance spraying process, and the fibre distribution tray is made of flame retardant plastic, which is light, flexible, strong and durable. The design of large-diameter coiled ring makes the radius of curvature of pigtail fibre and patch fibre keep above 40mm everywhere. It can be assembled into a fibre optic distribution frame alone, or with digital wiring unit and audio wiring unit in a cabinet/rack to form a comprehensive distribution frame. It has the functions of optical cable introduction, fixing and protection, optical cable termination and pigtail fusion splicing, cable transfer function and patch fiber storage, optical cable core and pigtail storage and protection.