Cracking catalyst as well as preparation method and application thereof

The invention relates to a cracking catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The problems that in the prior art, when a cracking catalyst sold in the market is adopted for a methyl tert-amyl ether cracking reaction, the activity of the cracking catalyst is low, the content of 2-methyl-2-butene in a product is relatively low, the yield of isopentene is low, and separation energy consumption is increased are solved. The cracking catalyst comprises amorphous aluminum silicate and an inert carrier, the amorphous aluminum silicate is prepared in a fractional precipitation mode, and the inert carrier is selected from one or more of Al2O3, SiO2 and activated carbon materials. The cracking catalyst has the advantages of high reaction activity and long service life, and can be applied to preparation of isopentene by catalyzing cracking of tert-amyl methyl ether, the content of 2-methyl-2-butene in the product is high, and the separation energy consumpt