The invention discloses diamond-like carbon coated glass and a preparation method thereof. The diamond-like carbon coated glass comprises a glass substrate, a functional film layer plated on the surface of the glass substrate, and a diamond-like carbon coated glass plated on the surface of the functional film layer, wherein the functional film layer is a low radiation film layer capable of being toughened, a low radiation film layer capable of not being toughening or a sunlight control film layer, wherein a substance on the outmost layer of the functional film is Si3N4, Ti3N4, TiO2, SnO2, SiO2, ZnO or SnZnO3. The diamond-like carbon film plated by the method has high stability, wear resistance and oxidative resistance, plays roles of preventing scratches and delaying oxidization in processes of glass transportation and storage, has good adhesion with the functional film layer, does not mutually erode and react with other film layers, and is volatilizable after a heat treatment process.