The utility model discloses a U -shaped tubular pile armour mounting tool, including U -shaped frame, top thick stick, top thick stick connecting seat, dynamic pressure piece, guide arm, stop screw, the both ends of U -shaped frame are fixed with level pressure piece and screw piece, the top thick stick connects soon in the screw piece, and the dynamic pressure piece is connected through top thickstick connecting seat and top thick stick, the guide arm passes the flexible hole of second of setting on the first flexible hole that sets up on the dynamic pressure piece and the level pressure piece in proper order, stop screw passes dynamic pressure piece and its tip card in the cylindrical surface's of guide arm the long shallow slot of axial, it is spacing on the dynamic pressure piece to make the guide arm, and then make as an organic wholeization of U -shaped tubular pile armour mounting tool structure, tear open in order to avoid the scene to piece together, during the construction lean on its whole takeing up in armour flange both sides, the armour flange bolt mounting hole is inserted or taken out with the guide arm, alright integral erection and dismantlement, and high in installation efficiency, the use is simpler, and can not appear because instrument ann tears the guide arm that leads to open, the drowning loss condition of tiny spare parts such as activity briquettingand nut, be favorable to construction on water.