The grinding machine comprises a frame, a worktable and a grinding head device. The two sides of the center of the frame are provided with a central rod, and the upper part of the center rod is provided with a support frame. The grinding head device is fixed above the support frame by bolts. The worktable includes a driving motor, an active roll, a passive roll, a driving belt and a supporting plate. The driving motor is fixed in the center by a bearing. On the top side of the rod, one end of the active roll is connected with the driving motor, the other end of the active roll is connected with the top side of the central rod through bearings, the two ends of the passive roll are connected with the other side of the central rod through bearings, and hollow grooves are arranged between the two sides of the transmission belt and the central rod. The suction bucket is provided with a suction pipe, the suction pipe is connected with the dust collector, and a control box is arranged on one side of the rack. The control box is connected with the rack through a suspension rod. The output end of the control box is electrically connected with the input end of the grinding head device.