The invention provides a double-pore-channel crystallization aluminosilicate molecular sieve catalyst and a preparing method thereof.The preparing method of the catalyst includes the following steps that a double-pore-channel crystallization aluminosilicate molecular sieve carrier with the ten-membered ring ordinal micropore characteristic and the twelve-membered ring ordinal micropore characteristic is adopted, wherein a twelve-membered ring has the non-through pore channel characteristic; the molecular sieve carrier is subjected to ion exchange through a weakly acidic solution, then the product is loaded and modified through metal elements or non-metallic elements to be dried and roasted, and the propylene methyl-alcohol or/and dimethyl-ether conversion preparing catalyst can be obtained.The catalyst is used for a propylene methyl-alcohol or/and dimethyl-ether conversion preparing reaction, the mass selectivity of propylene in non-aqueous products can be 50wt% or above, and the mass ratio of propylene to ethylene is larger than 15.