The invention provides a U-shaped reinforced insulation lapping device for a transposed conductor, belongs to the technical field of electric power, and relates to a bag picking and feeding mechanism used for woven bags. The mechanism comprises a base, and a U-shaped clamping wheel installation seat, a doubling clamping wheel installation seat and a rotating disc wire winding device are sequentially installed on the top of the base in the feeding direction of insulation paper; a U-shaped clamping wheel is rotatably arranged on the U-shaped clamping wheel installation seat which is further provided with a paper pressing guide rod matched with the U-shaped clamping wheel, and the U-shaped clamping wheel and the paper pressing guide rod can both move up and down along the surface of the U-shaped clamping wheel installation seat; a doubling clamping wheel is rotatably arranged on the doubling clamping wheel installation seat; the rotating disc wire winding device comprises a rotating disc driven by a motor. According to the lapping device, paper tape can be restrained reasonably in place, the situation that the paper tape deflects and cannot form the U shape cannot occur, and meanwhile the lapping device can effectively replace artificial wire winding.