Abstract: An anchor rod multi-section reaming machine tool and an application thereof are provided. The machine tool is used cooperatively with an anchor rod drill rig. A hydraulic cylinder is fixed at a lower end of a drill rod of the anchor rod drill rig. A lower end of the piston rod is fixed at an upper portion of an arch pressing device fixing disc. An arch pressing device comprises a pair of upper arch arms and a pair of lower arch arms, upper ends of the upper arch arms are rotatably connected with a central position of a lower portion of the arch pressing device fixing disc, lower ends of the upper arch arms are rotatably connected with upper ends of the lower arch arms, and lower ends of the lower arch arms are rotatably connected with a central position of an upper portion of a base plate.