▎ 摘　　要

NOVELTY - Neutral density filter comprises a glass substrate, a metal bonding layer provided on the glass substrate, and graphene film layer, where the graphene film layer is located on the metal bonding layer. USE - Neutral density filter used for shooting, various goggles and other precise optical elements and as an optical element for nearly non-selectively absorbing light within a particular wavelength band. ADVANTAGE - The neutral density filter has good structure stability and good hydrophobicity, resists the wiping force acting on the surface. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a neutral density filter, which involves: depositing metal film on the surface of the glass substrate as a metal bonding layer, growing graphene film on the metal bonding layer to obtain a product.