To provide an end cutting surface processing method of a wood powder plastic composite board which can make the cutting surface of the wood powder plastic composite board not conspicuous by preventing a sense of incongruity from the other non-cutting surface of the wood powder plastic composite board from being generated by seeing the rough cutting surface of the wood powder plastic composite board generated when the end of the wood powder plastic composite board is cut and processed white.

The end cutting side processing method of the wood powder plastic composite board A includes a heat pressing step of pressing the exposed and a cut surface of the wood powder plastic composite board A in the method of processing the cutting surface of the wood powder plastic composite board obtained by mixing and melting wood powder and plastic and molding the melted mixture. Preferably, the heating temperature is near the softening temperature of the plastic for constituting the wood powder plastic composite board A, and the heat pressing step is conducted by a heating roll 2 or a heating plate 3.