Processing method of upper pad in polishing pad

The invention provides a machining method for an upper-layer pad in a polishing pad. The machining method comprises the following steps that (1) the upper-layer pad on the surface to be milled in the polishing pad is cut; and (2) fixing the upper cushion on the to-be-milled surface cut in the step (1), and then carrying out milling treatment. According to the machining method, the upper-layer pad on the surface to be milled is cut, the machining amount is reduced, the milling speed of the upper-layer pad can be increased, the machining time is shortened, tool abrasion is reduced, and the machining efficiency is improved while the quality is guaranteed.