The sound absorption principle of sound-absorbing wooden boards is mainly to absorb sound through their porous structure inside. When sound waves are incident on the surface of the sound-absorbing board, a portion of the sound waves will be reflected, while another portion will enter the interior of the board. Inside the board, sound waves propagate through countless tiny holes or tiny gaps formed by the intersection of fibers. Due to the complex and long channels, the sound waves gradually consume energy during propagation, thus achieving the effect of sound absorption.