Line drawing device for calibration before welding of anchor rod positioning support

The utility model discloses a line drawing device for calibration before welding of an anchor rod positioning support in the field of side slope anchoring and shotcreting support, which comprises a metal circular ring and a metal pipe, the metal pipe penetrates through the center of the metal circular ring and is perpendicular to the metal circular ring, the metal pipe is connected with the metal circular ring through three metal rods, and the metal rods are connected with the metal circular ring. The included angle between every two adjacent metal rods is 120 degrees, a movable rod is arranged between every two corresponding adjacent metal rods, one end of each movable rod is connected to the metal circular ring, the other end of each movable rod is provided with a plastic rolling wheel, a cavity and a plurality of through holes are formed in each plastic rolling wheel, the cavities are filled with line drawing powder, and the through holes are communicated with the through holes. And the movable rod is conn