NOVELTY - Cracking device comprises a cracking reaction furnace (1), a pressure adjusting device (2), a cooling device (3), a carbon black collecting device (4) and a hydrogen production pressure swing adsorption tower (5), where the upper part of the cracking reaction furnace is a reaction section and the lower part is a combustion section, one path of a combustion section inlet is connected with a combustion-supporting gas conveying pipe through the pressure adjusting device and the other path is connected with a fuel gas conveying pipe.    USE - The cracking device is useful for co-producing carbon black and highly-pure hydrogen.    ADVANTAGE - The device: controls the oxygen-supply combustion-supporting low-heat value fuel gas and creates the high-temperature low-oxygen and oxygen-free cracking reaction environments, thus high-quality carbon black and highly-pure hydrogen can be co-produced; has simple structure, convenient flow, high yield and good product quality; and saves energy and reduces emission.    DETAILED DESCRIPTION - Cracking device comprises a cracking reaction furnace (1), a pressure adjusting device (2), a cooling device (3), a carbon black collecting device (4) and a hydrogen production pressure swing adsorption tower (5), where the cracking reaction furnace is composed of double furnaces in parallel, the upper part of the cracking reaction furnace is a reaction section and the lower part is a combustion section, one path of a combustion section inlet is connected with a combustion-supporting gas conveying pipe through the pressure adjusting device and the other path is connected with a fuel gas conveying pipe, the upper section of the reaction section is connected with a raw material conveying pipe and the top part is connected with a smoke discharging pipe and a carbon black-containing hydrogen-enriched gas discharging pipe, the hydrogen-enriched gas discharging pipe is orderly connected with the carbon black collecting device through the cooling device, the carbon black collecting device is provided with a carbon black collecting pipe and a hydrogen leading-out pipe, the hydrogen leading-out pipe is connected with the bottom of the hydrogen production pressure swing adsorption tower, and the top part of the hydrogen production pressure swing adsorption tower is provided with a highly-pure hydrogen discharging pipe and a waste gas discharging pipe.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a cracking device.    Cracking reaction furnace (1)    Pressure adjusting device (2)    Cooling device (3)    Carbon black collecting device (4)    Hydrogen production pressure swing adsorption tower (5)