The invention discloses a built-in wire sorting box device with an optical fiber tank. The built-in wire sorting box device comprises a base, a cover plate and routing bodies. The cover plate is matched with the base, the routing bodies are arranged between the base and the cover plate, a plurality of routing grooves are formed in one end surface of each routing body, a plurality of wire clampinggrooves are formed in two ends of each routing groove, protruded connecting pieces are arranged on the other end surface of each routing body and are matched with the tops of the corresponding wire clamping grooves, or the connecting pieces are matched with connecting grooves formed in the base. The built-in wire sorting box device has the advantages that a plurality of rubber-covered wire opticalcables can be led into the tip optical distribution optical fiber tank, optical signals can be led into adaptors, wire sequences and wire positions can be arranged in an orderly manner after the rubber-covered wire optical cables are bundled, fixed and sorted by the built-in wire sorting box device, accordingly, the service reliability can be improved, and follow-up expansion and maintenance management can be facilitated.