The invention relates to the field of energy conservation and emission reduction devices, and provides an activation catalyst for energy conservation, an automobile economizer containing the catalystand an installation method of the automobile economizer. The catalyst comprises a nano composite negative ion far-infrared material and a carrier. By means of the catalyst, the molecular activity of fuel molecules and oxygen molecules can be improved at the same time, the combustion environment is improved, and the combustion heat value of fuel is improved, so that the power of an engine during combustion of equal amount of fuel is higher, therefore the energy-saving effect is achieved, and the safety performance of an automobile and the service life of the engine are not affected. Besides, the power of the engine is improved by the activation catalyst for the automobile economizer, the energy-saving effect is achieved, and harmful gas in tail gas is also reduced. Meanwhile, oxidation is carried out in the exhausted gas, the harmful gas is decomposed, and the catalyst in the tail gas in a silencer is activated. According to the installation method, the energy-saving and emission-reducing effects of the engine at different rotating speeds can be taken into consideration, so that the optimal energy-saving and emission-reducing effects are achieved in general.