The invention discloses a wood processing paint spraying device. The wood processing paint spraying device comprises a paint spraying box, wherein a conveying mechanism, a spraying mechanism, a clamping mechanism and a drying mechanism are arranged in the paint spraying box; and the conveying mechanism is characterized in that first electric push rods are fixedly connected to the top and the bottom of the inner wall of the paint spraying box, the bottoms of the first electric push rods are fixedly connected with bearing plates, the outer walls of the first electric push rods are sleeved with first springs, and limiting grooves are formed in the two sides of the conveying mechanism. According to the wood processing paint spraying device, transmission rollers are arranged, a motor is started to drive driving blades to rotate around a first rotating shaft, the driving blades knock driven blades when rotating so that the driven blades can rotate around a transmission rod, then a spur gear meshed with the driven blades can rotate, a first rotating rod can rotate, a first fixing rod enables the transmission rollers to rotate under the action of a first belt, protrusions arranged on the outer walls of the transmission rollers increase the friction coefficient of the device, so that wood plates can be conveyed more stably, meanwhile, the distance between the two rotating rollers can be conveniently adjusted through the limiting grooves, and then the wood plates can be transmitted more accurately.