The invention discloses a gluing device for gluing a straw board. The device comprises a conveyor and a controller, wherein supporting rods are fixedly connected to two sides of the top part of the conveyor; a top plate is fixedly connected to the top parts of the supporting rods, and a glue box is fixedly connected to the right side of the top part of the top plate; a liquid level sensor is fixedly connected to the bottom part of the right side of an inner chamber of the glue box; an alarm is fixedly connected to the right side of the top part of the glue box; a hose communicates with the bottom part of the left side of the glue box; and a suction pump communicates with one end, far away from the glue box, of the hose. According to the gluing device for gluing the straw board, the conveyor, the controller, the glue box, the liquid level sensor, the alarm, the hose, the suction pump, a glue injecting pipe, an electric telescoping rod, a fixing plate, an infrared distance sensor, an injecting head and a brush are matched to use to mechanically glue the straw board, so that the working efficiency is improved, and the labor cost is decreased; and meanwhile, the problem that the body health of workers is damaged can be avoided.