To prevent the breakage of a wood treatment apparatus and to secure a treated article free from impurities by removing the impurities contained in wood to be treated which may cause a trouble from the beginning, in the wood treatment apparatus for subjecting the wood to be treated to various treatments such as peeling, crushing or the like.

In the wood treatment apparatus having a main rotor 2, which has a plurality of notches 7 for catching the wood W to be treated formed on its peripheral surface and can be rotated around its horizontal shaft, and a processing part 3 for appropriately treating the wood W wound up by the main rotor 2, a sub-rotor 10, which is rotated relatively in the direction reverse to the rotary direction of the main rotor 2, is installed at the position adjacent to the main rotor 2, and a rotor gap G which can remove the impurities in the wood W is formed between the main rotor 2 and the sub-rotor 10.