Catalyst for hydrocarbon steam cracking, method for preparing the same and method for preparing olefin by using the same

A catalyst for hydrocarbon steam pyrolysis, a manufacturing method thereof and an olefin manufacturing method are provided to improve the selection of the light olefin, deactivate caulk and improve thermal/mechanical stability at high temperature by using the catalyst for hydrocarbon steam pyrolysis. The complex catalyst which is indicated as the CrZrjAkOx and powder of carrier includes powder or oxide catalysts and mixture catalyst. The complex catalyst in which the powder of the oxide catalyst indicated as CrZrjAkOx and powder of carrier are sintered after mixing and the complex catalyst in which the oxide catalyst is dipped in carrier are manufactured.