The invention relates to an edging device for desk tops, which belongs to the technical field of school desks or table processing, and includes a frame on which a lever, a cam and a ratchet are installed, and the lower surface of one end of the lever is offset against the cam. A piston is connected to the upper surface of the other end of the lever, and a support rod is connected to the lower surface of the other end of the lever; a grinding rod is hinged on the surface of the cam wheel, a chute and a grinding head are arranged on the grinding rod, and a slider is hinged on the rod, and the slider slides Cooperate in the chute; there is a pawl hinged on the support rod, the pawl is located under the grinding rod, the ratchet is coaxially connected with a support plate, the support plate is evenly connected with a clamping rod, and the end of the clamping rod is provided with a clamping plate; The piston is connected with a conduit for absorbing debris. The technical scheme not only has a good grinding effect, but also improves the processing efficiency, collects waste chips in a concentrated manner, does not affect people's work, and is ingenious in design and strong in practicability.