The invention discloses a method for improving the interface bonding performance between composite flexible decorative veneer and surface facing through plasma modification. The method sequentially comprises the following technology steps that surface pretreatment of the decorative veneer, low-temperature plasma treatment of the surface of the decorative veneer, low-temperature plasma treatment of the surface of a plastic film, assembly and hot pressing of the decorative veneer and the plastic film, and facing hot-pressing of the plastic-film-reinforced flexible decorative veneer. By the adoption of the method for improving the interface bonding performance between the composite flexible decorative veneer and the surface facing through plasma modification, woodwork surface facing is conducted through the plastic-film-reinforced flexible decorative veneer manufactured through plasma modification treatment, an adhesive is not needed, the procedure of applying the adhesive can be omitted, the bonding strength of the facing surface of the product can be improved by 10%-70%, the adhesive force of a paint film can be improved by 20%-40%, the production cost can be reduced by 10%-50%, energy is saved, environmental friendliness is achieved, operation is easy and convenient, and efficiency is high.