The invention discloses a method for veneering at the surface of a wood-plastic composite material, relates to a veneer decorating method of the wood-plastic composite material, and aims at solving the problems of difficult veneering at the surface of the traditional polyolefin wood-plastic composite material, complicated process and high cost. The method comprises the following steps of: 1, preheating; 2, preparing a veneer sheet; and 3 cooling and finalizing the design to finish veneering. The veneering method disclosed by the invention is simple and convenient to operate, high in surface bonding strength, and economical in energy source. By adopting the method disclosed by the invention, auxiliary facilities such as coating equipment and glue preparation equipment are not needed; a special adhesive is not used; and special surface treatment is also not needed, so that the cost is reduced. The wood-plastic composite material adopts non-polar thermoplastic plastic as a substrate, and does not generate incompatibility with polar lignocellulosic materials; and the wood-plastic composite material and the polar lignocellulosic materials cannot be firmly bound together by common adhesive easily. According to the method, a surface decorative material and the wood-plastic composite material are firmly spliced by using wood-plastic matrix plastic and a coupling agent with bipolar groups. Therefore, the method can be used for carrying out veneering decoration on the surface of the wood-plastic composite material.