▎ 摘　　要

NOVELTY - The method comprises (i) depositing ultra-nano diamond on a surface of a substrate by hot-wire chemical vapor deposition to obtain an ultra-nanocrystalline diamond (UNCD) coating, (ii) using magnetic control sputtering technology to deposit metal coating on the surface of UNCD coating to obtain UNCD-metal coating, where the metal coating is a continuous coating or a discontinuous coating, and (iii) heat-treating the UNCD-metal coating to obtain a low-friction metal/ultra-nano-diamond complex coating, where the metal coating is copper coating, gold coating or nickel coating, and using inert gas as protective gas in the heat treatment process, where inert gas is argon, providing low-friction metal/ultra-nano-diamond complex coating with a metal layer, a UNCD coating and an ordered carbon nanostructure generated in situ by the ultra-nano-diamond, and providing ordered carbon nanostructures with graphene structures, carbon nanotube structures or fullerene structures. USE - The method is useful for preparing low friction metal/ultra-nano diamond complex coating in field of surface treatment of friction parts (claimed). ADVANTAGE - The method: utilizes high-temperature heat treatment and tribothermal catalysis to induce ordered carbon nanostructures to form on the UNCD coating, thus improving the tribological properties of the coating; has high temperature resistance, high hardness and excellent friction performance; and is simple and controllable.