The invention discloses a rod member clamping tool used in the field of machining, which comprises a body, a limit barrier fixedly arranged at one side of the body, an installing block fixedly arranged on the upper part of the body, a fixed upper pressure block fixedly arranged on the upper part of the installing block, a fixed block fixedly arranged on the upper part of the body and provided with a fixed groove, and a rotating upper pressure block rotatably arranged on the upper part of the body, wherein a limit screw is arranged on the limit barrier, the fixed upper pressure block is provided with a through hole, the through hole is provided with a limit rod, the rotating upper pressure block is provided with a rotating shaft screw fixedly arranged on the body and an auxiliary screw arranged on the end part of the rotating upper pressure block, and a spring is sleeved on the rotating shaft screw. The invention has the advantages of simple and practical structure, simple and rapid disassembly and assembly, good clamping effect and high processing speed, is convenient to operate, improves the production efficiency of enterprises and has very positive meaning.