Wood crusher adopts blade cutting, high-speed airflow impact and collision dual crushing functions in one, and can complete the micro-material sorting process at the same time. During the blade cutting and crushing process, the rotor generates high-speed airflow, which rotates with the cutting direction of the blade, and the material is accelerated in the airflow, and repeated impacts cause the material to be double crushed at the same time, which accelerates the crushing rate of the material.