The invention provides a catalyst for producing propylene by the catalytic cracking of naphtha and a preparation method thereof. The catalyst comprises a regular structure carrier and an active ingredient coating distributed on the inner surface and/or the outer surface of the regular structure carrier; a molecular sieve comprises a first molecular sieve and a second molecular sieve, wherein the first molecular sieve is a molecular sieve with a ten-membered cyclic one-dimensional elliptic porous structure; the second molecular sieve is a molecular sieve with a twelve-membered cyclic porous structure. The invention further provides a method for producing propylene by the catalytic cracking of naphtha. With adoption of the catalyst provided by the invention, the yield of propylene can be increased, and the ratio of obtained propylene to ethylene is 2 or above.