The invention provides a bevel cutting machine for a wood material, and belongs to the field of wood material processing equipment. Two vertical circular saw blades, which are oppositely arranged at the top and bottom of a straight line, are arranged on the bevel cutting machine; a worktable on which a profile supporting plate is arranged is positioned between the two saw blades; included angles between the circular saw blades and the supporting plate are 45 degrees; the saw blades are correspondingly assembled to shafts of an upper motor and a lower motor; the upper and lower motors can synchronously move along the length direction and the vertical direction of a wood profile. With the adoption of the machine, the bevel processing speed of the wood profile 22 can be improved; the bevel processing accuracy and batch consistency can be ensured; the end part of the wood profile 22 can be cut in an angle of 45 degrees, particularly corner parts of a door frame and a window frame can be processed to form bevel angles of 45 degrees, and thus the aesthetics of a door and window can be increased.