The invention discloses a log turning and feeding machine tool which comprises a rack and a feeding device used for conveying logs to a sawing device. A first roller shaft and a second roller shaft are symmetrically arranged on the two sides of the feeding device, the two roller shafts are installed in installing holes formed in shaft seats, the shaft seats are connected with a lifting device, a clamping device is arranged on the upper portion of the rack, one of or both the two roller shafts are connected with rotary motors, and the rotary motors are electrically connected with a handle switch. The log turning and feeding machine tool achieves the automatic turning function of the logs, and feeding and clamping processes are accomplished automatically, the automation degree of woodworking sawing machinery is improved, and meanwhile, labor intensity is relieved, working efficiency is improved, and the whole machining time is shortened.