The invention discloses a CO2 high-temperature methanation catalyst and particularly discloses a high-concentration CO2 methanation catalyst, which belongs to the technical field of catalysts. The CO2 high-temperature methanation catalyst comprises a carrier, an active component and auxiliaries, wherein the active component is nickel oxide and the auxiliaries comprise aluminum oxide, lanthanum oxide and chromic oxide. Specifically, the components are as follows in parts: 20-40 parts of the carrier, 40-60 parts of nickel oxide, 15-25 parts of aluminum oxide, 2-4 parts of lanthanum oxide and 1-3 parts of chromic oxide. The CO2 high-temperature methanation catalyst disclosed by the invention is high in mechanical strength and good in heat stability and shows excellent activity in methanation reaction of CO2. The catalyst is suitable for methanation reaction of gas components with relatively high content of CO2 in synthesis gas from coal and can be further used in the field of CO2 emission reduction.