The invention relates to a wood board end leveling device and a working method thereof. The wood board end leveling device comprises a rack and a sliding seat which are arranged on a wood processing production line, the sliding seat is provided with a turning-over table with the first end being hinged to the sliding seat, the turning-over table is provided with a platform face and a pressing plateused for pressing wood board strips, the multiple longitudinally-arrayed wood board strips can be placed on the platform face, a driving mechanism for lifting and turning over the second end of the turning-over table is arranged between the sliding seat and the turning-over table, after the second end of the turning-over table is lifted, the platform face and the wood board strips on the platformface are in an inclined state, and a blocking strip for blocking the wood board strips is arranged at the first end, close to the turning-over table, on the rack. According to the wood board end leveling device, through the inclined platform face, the wood board strips located on the platform face slide down along with the gravity, through blocking of the blocking strip located at the low position, one ends of the wood board strips located at the low position are absolutely flush, thus combs meeting the requirements are advantageously and subsequently processed, wood waste is reduced, and theworking efficiency is improved.