Draw-bar box roller

The utility model relates to the technical field of luggage rollers, in particular to a trolley case roller, which comprises a roller carrier and guide wheels arranged on two sides of the roller carrier, a movable space is arranged in the roller carrier, an elastic part and a movable seat are vertically mounted in the movable space, the elastic part is connected with the movable seat, and the movable seat can reciprocate along the vertical direction. A connecting pipe is embedded in the movable seat, the two ends of the connecting pipe are connected with rotating shafts respectively, the guide wheel is rotationally connected with the wheel frame through the rotating shafts, a receding opening communicated with the movable space is formed in the wheel frame, the connecting pipe penetrates through the receding opening, and the diameter of the connecting pipe is smaller than the length of the receding opening in the vertical direction. The luggage case has the beneficial effects that the use stability of the lug