Method for preparing 3D glass from float glass

The invention provides a method for preparing 3D (three-dimensional) glass by using float glass, which comprises the following steps: firstly, distinguishing an air surface and a tin surface of the float glass, and then taking the air surface as a concave surface of a 3D glass product with the thickness of 0.008-0.020 mm. In the 3D glass production process, the size and the arc height serve as key control indexes, due to the difference between the air surface and the tin surface of float glass, the stability of the size and the arc height is poor, and batch production and processing are not facilitated; according to the invention, the air surface is used as the concave surface of the 3D glass product, and the tin surface is used as the convex surface of the 3D glass product for polishing, so that certain regularity can be presented; meanwhile, by controlling the removal amount of the concave and convex surfaces of the 3D glass product, the difference of two surfaces caused by tin permeation and dealkalization