NOVELTY - The hydrogen-producing device comprises a tank body, a hydrogen gas releasing circuit system, a top sealing cover, a gas drying chamber, a water circulation system, and a shell, where the structure of the device is a sealed cylinder. An outer part of the water circulation system is provided with the shell. A sealing plug is provided with an inner container of the feeding tank. The feeding tank and the top sealing cover are arranged on the upper part of the shell formed with a ring groove via an air valve. The feeding tank and a cylindrical sleeve are provided with a gas buffer chamber.    USE - The hydrogen producing device is useful in a fuel cell.    ADVANTAGE - The device has improved heat transfer and mass transfer function, high production efficiency, safety and reliability.    DETAILED DESCRIPTION - The hydrogen-producing device comprises a tank body, a hydrogen gas releasing circuit system, a top sealing cover, a gas drying chamber, a water circulation system, and a shell, where the structure of the device is a sealed cylinder. An outer part of the water circulation system is provided with the shell. A sealing plug is provided with an inner container of the feeding tank. The feeding tank and the top sealing cover are arranged on the upper part of the shell formed with a ring groove via an air valve. The feeding tank and a cylindrical sleeve are provided with a gas buffer chamber. The cylindrical sleeve is provided with an outer side of a heat drying tray. The cylindrical sleeve and an electric control valve are arranged on a lower end of the feeding tank, where the cylindrical sleeve is formed with a through hole. The top part of the sealing cover is provided with the drying tray. The cylindrical sleeve comprises a heat-conducting drying frame arranged in a semi-slip feeding tank. The hydrogen gas releasing circuit system is provided with a hydrogen-releasing branch of a pressure gauge, an integrated valve, a pressure reducing valve, a flow controller and a pressure gauge. The inner container is divided into a lower layer and two upper layers, where the lower layer is provided with a hydrogen chamber, and the upper layers are provided with the drying chamber. The heat drying tray is formed with a vent hole having an inner diameter of 8.