Sleeve pipe overhauls special use ladder of ascending a height relates to the ladder of ascending a height. At present, it can not compromise security, convenience and economic nature to ascend a height the operation means. The utility model discloses a soft contact that staircase, ability and the sleeve pipe of locating staircase upper portion match, locate the staircase lower part be used for increase the staircase and ascend a height the angle of angle and increase the device, the angle increases the device and includes that the angle increases the frame, locates the angle and increase the supporting legs of rest base portion, locate the angle and increase soft of frame one side, and the angle increases frame one side and be being connected side with the staircase of staircase sub -unit connection, and the angle increases is connected the side opposite side for the sleeve pipe side that matches with the staircase on the frame, and the sleeve pipe matches the side and is equipped with soft piece, and the lateral surface of soft piece is the interior concave surface of arc that ability and sleeve pipe match. This technical scheme has established soft contact on upper portion, the sleeve pipe vase of avoiding damaging, it increases the device to add the angle, increase staircase and sleeve pipe angle, improve the staircase stability, reduce the possibility of turning on one's side and turning over after and, compromise security, convenience and economic nature.