The invention discloses a round wood processing clamping device which comprises a working table. Supporting legs are fixedly connected to the four corners of the lower surface of the working table, afixed plate is slidably connected to the upper surface of the working table, a first support plate and a drive motor are fixedly connected to the upper surface of the working table in the horizontal direction in sequence, a circular through hole is formed in the side wall of the first support plate, a rolling bearing is fixedly connected to the hole wall of the circular through hole, a threaded tube is fixedly connected to the interior of the rolling bearing, a threaded rod is in threaded connection with the inner wall of the threaded tube, the end, close to the fixed plate, of the threaded rod is fixedly connected with the side wall of the fixed plate, the outer wall of the threaded tube is fixedly sleeved with a first gear, and a second gear is fixedly connected to an output end of the driving motor. Accordingly, people do not need to fix round wood with hands, time and labor are saved, the wood clamping quality is improved, the round wood clamping efficiency is improved, the wood does not need to be lifted manually, and the labor intensity of workers is lowered.