The invention discloses a carbon nanotube-manganese oxide composite material for efficiently catalyzing methane and a preparation method thereof, belonging to the field of new energy. With a focus onsolving problems in utilization of low-concentration methane gas, a catalytic oxidation catalyst system is developed. According to the invention, the carbon nanotube-manganese oxide composite materialis prepared by using an impregnation method; and then, the composite material is subjected to catalytic degradation determination experiments of methane combustion. Compared with all the conventionalmaterials, the carbon nanotube-manganese oxide composite material for efficiently catalyzing methane in the invention has the advantages of small particle size, high dispersity and capacity of greatly lowering the temperature of complete combustion of methane, reducing the degree of environmental pollution caused by combustion of methane in a conventional manner and improving the utilization efficiency of methane. The preparation method of the invention has the advantages of simple steps, easy operation, mild preparation conditions, easy control and high efficiency.