The working principle of the dry rod mill is the same as that of the wet rod mill. The gearing-down of a electrical machinery and peripheral gear drives the cylinder body of the dry rod mill rotates. The appropriate steel rod is installed in the cylinder body of a dry rod mill as the grinding medium. Under the action of centrifugal force and friction force, the grinding medium is lifted to a certain height and dropped down. The materials are continuously sent into the cylinder body of a dry rod mill from the feeding port, then crushed by the moving grinding medium, and discharged out of the dry rod mill by the overflow and the continuous feeding.