Glass sanding production line is through the high-speed jetting fine sand or dust particles on the glass surface to achieve the purpose of cleaning and changing the roughness of the glass surface, this treatment can improve the adhesion between the glass and the paint, extend the durability of the film and help the paint levelling and decoration, in addition to removing impurities on the surface of the glass, impurity, colour and oxidation ﹑ to optimize the surface of the substrate and the residual stress of the surface of the smoothness, thus enhancing the surface hardness of the substrate. In addition, by removing impurities, colours and oxidation layers, the surface of the substrate is optimised for residual stress and smoothness, thus enhancing the surface hardness of the substrate.