The invention discloses a centerless grinding machine. The centerless grinding machine comprises a grinding machine base, a water collecting water tank, a grinding wheel and a metal chip filtering plate, two grinding wheel adjusting sliding rails are fixedly installed on the upper surface of the grinding machine base, a water cooling system is connected to the upper surface of the grinding machinebase in an inserted mode, a horizontal rod is welded to the top of the water cooling system, and a water level adjusting sliding block is connected to the upper surface of the horizontal rod in a sliding mode; and one side of the water cooling system is connected with a water supply pipe in an inserted mode, and the water collecting water tank is fixedly installed inside the grinding machine base. According to the centerless grinding machine, the metal chip filtering plate is fixedly connected to the center of the inner part of the water collecting water tank, cooling liquid flowing down after grinding through the centerless grinding machine can be filtered through the metal chip filtering plate, scrap iron left by grinding through grinding wheel inside the cooling liquid is filtered, sothat the situation that the scrap iron is sprayed onto the grinding wheel again after passing through the water cooling system, then scratches are left on the surface of a ground workpiece is avoided,and the problem that the interior of the cooling liquid cannot be secondarily utilized due to the residual scrap iron is solved.