The invention discloses a round drill rod centralizer for the split coal mine, which comprises a centralizer main body and a centralizer slip set; wherein the centralizer body is provided with two first key grooves and two second key grooves for installing the centralizer slip set in the direction of the axial of the body. The centralizer slip set comprises two slips of the same structure and mutually cohesive, the length of each slip is equal to one-half of the length of each first key groove, the outer diameter of each slip matches with the diameter of a drilled hole, and the inner diameterof each slip is the same as the diameter of the round drill rod. The inner wall of each slip is provided with a first convex key along the axial direction, the first convex key is arranged in the first key groove, and one end of the first convex key is abuts against one end of the first key groove. The centralizer body of the invention is connected with the round drill rod at the rear side of a clamper, and when the centralizer body passes through the clamper, the centralizer slip set is mounted and hung on the centralizer body, so that the inclination degree of the drill hole is increased, stabilized or decreased during the drilling process. The drill rod centralizer is easy to install and disassemble, which can improve the utilization rate of the centralizer in actual coal mine drilling.