The utility model provides a protection device suitable for cable optical cable signboard, put up including arranging and fix the signboard manager monomer on the frame of arranging, follow the frame of arranging and vertically be equipped with a plurality of layers of signboard manager monomer in proper order, be equipped with the draw -in groove that a plurality of is used for placing the signboard on every layer of signboard manager monomer, it is equipped with the connection bayonet socket to arrange a both sides for the fixed signboard protection management ware monomer of arrangement, signboard protection management ware monomer includes major structure backplate and signboard draw -in groove, be provided with transparent signboard draw -in groove structure in the front of major structure backplate, the line of a plurality of signboard draw -in groove is on same horizontal line, three face seals of signboard draw -in groove, an opening is equipped with the sealing strip, the sealing strip constitutes airtight space with the draw -in groove jointly, the shape of signboard draw -in groove is unanimous with the signboard, the device can effectively protect the signboard, the work personnel management cable optical cable information of being convenient for, maintain to power equipment that the trade has extensive practicality.