The present invention relates to a carbon dioxide capture device using a fuel cell power generation system and a method thereof, in which a pure oxygen combustion process is performed to reform a fuel supplied from the storage tank 20 and the fuel supplied from the storage tank 20. Fuel reformer 40, CCS module 60 for separating the hydrogen and carbon dioxide produced by the reforming reaction from the fuel reformer 40, and stores the carbon dioxide, and receives hydrogen from the CCS module 60 Fuel cell power generation system 80 to generate electric power and supply it to equipment 120 requiring power, and surplus power of the fuel cell power generation system 80 is supplied to electrolyze water to generate oxygen and hydrogen. It includes the electrolytic system 100 to. According to the present invention, it is possible to produce additional power by storing the hydrogen generated in the hydroelectrolysis system, to solve the load followability of the fuel cell, high-purity oxygen is generated, which is produced in the fuel reforming through the pure oxygen combustion process By generating carbon dioxide by use, it is easy to capture carbon dioxide, and has the effect of extracting hydrogen from both methane and water vapor of fuel.
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