Inner-cooling reamer

The utility model provides an internal cooling reamer. The reamer comprises a reamer body, a mounting chuck is fixedly connected to the outer surface of the upper end of the reamer body; a cooling through hole inlet is formed in the outer surface of the upper end of the mounting chuck; a labor-saving anti-deviation mechanism is arranged on the outer surface of the reamer body, a reamer head replacement structure is fixedly connected to the outer surface of the lower end of the reamer body, a cooling through hole outlet and a cutting edge are arranged on the outer surface of the reamer head replacement structure, and the cooling through hole outlet is located in one side of the cutting edge. The utility model relates to an internal cooling reamer. The labor-saving anti-deviation reamer is provided with the labor-saving anti-deviation mechanism and the reamer head replacement structure, the machining precision and the machining speed can be effectively improved, the reamer cannot deviateand incline when used, m