The invention relates to a waste resource utilization, greenhouse gas emission reduction and resource utilization technology and particularly relates to a method for fixing carbon dioxide by employing an organic amine-industrial gypsum system. The method comprises the steps of mixing organic amine and industrial gypsum to prepare suspension slurry, introducing a simulated flue gas containing CO2 into the slurry and carrying out carbonation reaction. Products are calcium carbonate and organic amine sulfate; the calcium carbonate can be used for development of industrial products such as light calcium carbonate, and the organic amine sulfate is capable of achieving generation of an absorption liquid through the methods such as electrodialysis. Compared with traditional ammonia-industrial gypsum carbon fixation system, the built organic amine-industrial gypsum system has the advantages of being low in pollution and renewable on the premise of ensuring the carbon fixation efficiency.