The invention relates to a wood processing device, in particular to a wood slicing device. The wood slicing device comprises a machine frame, a saw blade and a plurality of clamping pieces, wherein the saw blade is fixed on the machine frame, the machine frame is provided with a conveyor belt, the clamping pieces are fixed on the conveyor belt, and the clamping pieces comprise a first clamping piece and a second clamping piece which are oppositely arranged on the two sides of the conveyor belt respectively; the clamping pieces are provided with an adsorption mechanism, the adsorption mechanism comprises two suction cups, an air suction device and an air cylinder, and the two suction cups are fixed on the first clamping piece and the second clamping piece respectively; the air suction device is connected with the suction cups and the air cylinder, and a piston is slidably connected in the air cylinder, a piston rod used for pushing the clamping pieces to move outwards is connected to the outer side of the piston, and the piston rod is connected between the first clamping piece and the second clamping piece; and the air suction device is connected with a stepping motor, and the stepping motor is provided with a control switch for controlling the rotation direction of the stepping motor. According to the scheme, the saw blade can be effectively prevented from being clamped, and the wood can be effectively prevented from sliding.