Atmospheric concentrations of carbon dioxide (CO<sub>2</sub>), a major cause of global warming, have been rising due to industrial development. Carbon capture and storage (CCS), which is regarded as the most effective way to reduce such atmospheric CO<sub>2</sub> concentrations, has several environmental and technical disadvantages. Carbon capture and utilization (CCU), which has been introduced to cover such disadvantages, makes it possible to capture CO<sub>2</sub>, recycling byproducts as resources. However, CCU also requires large amounts of energy in order to induce reactions. Among existing CCU technologies, the process for converting CO<sub>2</sub> into CaCO<sub>3</sub> requires high temperature and high pressure as reaction conditions. This study proposes a method to fixate CaCO<sub>3</sub> stably by using relatively less energy than existing methods. After forming NaOH absorbent solution through electrolysis of NaCl in seawater, CaCO<sub>3</sub> was precipitated at room temperature and pressure. Following the experiment, the resulting product CaCO<sub>3</sub> was analyzed with Fourier transform infrared spectroscopy (FT-IR); field emission scanning electron microscopy (FE-SEM) image and X-ray diffraction (XRD) patterns were also analyzed. The results showed that the CaCO<sub>3</sub> crystal product was high-purity calcite. The study shows a successful method for fixating CO<sub>2</sub> by reducing carbon dioxide released into the atmosphere while forming high-purity CaCO<sub>3</sub>.