With the event of carbon dioxide (CO2) seize, storage and utilization (CCSU) applied sciences, CO2 has regularly grow to be a desired feedstock for the manufacturing of value-added chemical compounds like methane (CH4). Ceria (CeO2)-based catalysts have gained a lot consideration due to their potential to effectively hydrogenate CO2 to CH4 beneath gentle situations. Right here we systematically define the advances in CeO2-based catalysts for CO2 methanation primarily from the attitude of mechanism investigation and catalyst improvement. Numerous in situ/operando and ex situ applied sciences have verified that energetic steel and oxygen vacancies on the steel/steel oxide–CeO2 interface act because the prime energetic websites to advertise the formation and hydrogenation of key intermediates in the course of the CO2 methanation response. Kinetic evaluation and in situ DRIFT characterization mixed with theoretical calculations revealed that the response mechanism towards CO2 methanation is delicate to energetic websites, and the formate route versus the carboxyl (CO*) route has been extensively detected as the principle methanation pathway over CeO2-based catalysts. Moreover, mainstream methods to enhance CeO2-based catalysts embody optimizing reducibility, adjusting the distribution of fundamental websites, dispersing energetic steel supported on CeO2, and growing the quantity of oxygen vacancies or further energetic websites for CO2 adsorption and selective hydrogenation into CH4. Lastly, views on the deeper understanding of energetic websites and intermediates’ evolution and the challenges of CeO2-based catalysts for CO2 methanation in future investigations are offered.