NOVELTY - Hydrogen producing device comprises a light transmitter and a closed optical bioreactor. The optical bioreactor comprises a gas storage chamber connected to the upper part of a bubble chamber. A material inlet of a tower plate-type reaction tank is connected at the lower part of the middle part on the side wall of a storage chamber. The storage chamber is connected to the tower plate-type reaction tank. A discharge hole is set on the side wall of the tower type reaction tank and bubble chamber. An air outlet is located at the top of an air outlet pipe which is connected to a gas return pip.    USE - Used as a hydrogen producing device.    ADVANTAGE - The device is simple to operate; maintains uniform temperature in the reactor; produces dark material liquid, and hydrogen from food-waste fermentation; is environmental-friendly; reduces consumption of energy; improves the production rate of hydrogen; and has stable, efficient and continuous operation.    DETAILED DESCRIPTION - Hydrogen producing device comprises a light transmitter and a closed optical bioreactor. The optical bioreactor comprises a gas storage chamber connected to the upper part of a bubble chamber. A material inlet of a tower plate-type reaction tank is connected at the lower part of the middle part on the side wall of a storage chamber. The storage chamber is connected to the tower plate-type reaction tank. A discharge hole is set on the side wall of the tower type reaction tank and bubble chamber. An air outlet is located at the top of an air outlet pipe which is connected to a gas return pip. A hydrogen return pipe is connected at the lower part of the bubble chamber. The tower type reaction tank is alternately arranged with a quartz side optical fiber and U-shaped heat exchanger tower plate from top to bottom. The side optical fiber of the tower plate is connected to a sunlight transmission device. The U-shaped heat exchanger tower plate is connected to a heater.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the hydrogen producing device.