Large disc detection method

The invention belongs to the technical field of grinding and polishing, and discloses a large disc detection method which comprises the steps that S1, the goodness of fit between an upper disc and a lower disc is detected, specifically, pressure-sensitive paper is laid on the lower disc, and the inner side annular area, the middle annular belt area and the outer edge annular area of the lower disc are at least partially covered with the pressure-sensitive paper; the upper disc is controlled to fall to press the lower disc; after the upper disc presses the lower disc for a preset time T, the upper disc is controlled to ascend; and observing the color change of the pressure-sensitive paper laid on the lower tray, and if the color change of the pressure-sensitive paper is uniform and the color is relatively consistent, proving that the goodness of fit between the upper tray and the lower tray is good. The goodness of fit detection method is convenient to operate, can quickly and accurately detect the goodness of