To provide a wood processing method for molding wood without causing a crack in the wood even when the shape change of the wood before and after compression is large.

The wood processing method has: a primary compression process for compressing wood in a unidimensional direction when the wood is compressed into a three-dimensional shape different from the shape before the processing of the wood; a shaping process for shaping a blank material from the wood compressed in the primary compression process; and a secondary compression process for grasping the blank material shaped in the shaping process by a pair of molds in a steam atmosphere higher than the atmosphere in temperature and pressure. The unidimensional direction is set to the direction almost crossing the fiber direction of the wood at a right angle and, when the blank material is grasped by a pair of the molds in the secondary compression process, one mold is set to the direction crossing the moving direction relatively moved with respect to the other mold at a right angle.