The utility model discloses a RS485 is self -supporting paired line wire stripping instrument for communication, shake hands, the spring, fixedly shake hands, right connecting block, cut off the edge of a knife, activity wire stripping portion, first heart yearn wire stripping hole, second heart yearn wire stripping hole, the shielding layer edge of a knife, the self -acceptance steel wire edge of a knife and the insulating layer edge of a knife including wire stripping instrument main part, movable block, fixed wire stripping portion, left connecting block, head, activity, the utility model discloses need multiple instrument during can effectual solution current self -supporting paired line wire stripping, and the step is more, is unfavorable for special place operations such as eminence, easily harm the problem of inside paired line in addition when getting rid of the shielding layer, fixed wire stripping portion and activity wire stripping portion have been set up to and correspond between fixed wire stripping portion and activity wire stripping portion and be equipped with the different edges of a knife, wire stripping that can the effectual different positions of assurance RS485 self -supporting paired line need, convenient operation moreover makes things convenient for the open -air construction and installation of RS485 self -supporting paired line very much.