The utility model provides a coupling CO2 utilization's hydrogen manufacturing energy memory, including electrical cell, the hydrogen manufacturing unit, a control unit, be provided with CO2 import and fuel inlet's reversible SOFC, electrical cell's electrical output is connected with hydrogen manufacturing unit and reversible SOFC's electric input end respectively, reversible SOFC's electrical output links to each other with the hydrogen manufacturing unit, the control unit is according to electrical cell's generated energy, the required power consumption control electrical cell's of required power consumption of hydrogen manufacturing unit electrolysis and reversible SOFC electrolysis electric energy output, the electric energy input of hydrogen manufacturing unit, reversible SOFC's electric energy output / input. The utility model discloses a renewable energy has not only been reserve to the device, has still realized CO2's utilization, has effectively solved because of adopting wind energy, solar energy power generation to lead to electrolytic hydrogen production's intermittent type nature and fluctuation problem to can also avoid consuming conventional electric energy, reduce the electrolytic hydrogen production cost by a wide margin, improve the electrolytic efficiency, extension electrolytic device's life, improvement electrolytic device's stability and energy utilization.