Steam cracking catalyst, preparation and application thereof

The present invention provides a catalyst for preparing low carbon olefin by steam cracking, a preparation method and an application thereof. The catalyst by weight percent contains 1 to 10 percent of calcium aluminate, and 90 to 99 percent of other aluminiferous compound carriers except the calcium aluminate with the specific surface area between 80 and 300m /g. The catalyst has the advantages of suitable pore structure, high catalytic activity, low reaction temperature, high mechanical strength and so on. The method for preparing the low carbon olefin by using the catalyst has the advantages of high air speed, high percent conversion and high yield of the low carbon olefin.