The invention provides a method for making molecular sieve membranes through simulating biological protein dopamine functional modification. The method is concretely characterized in that LTA and FAU type molecular sieve membranes with high separation performances are made on the surfaces of dopamine modified porous alumina and other carriers through a covalent bonding reaction by using the excellent complexing performance of dopamine. The method for making the molecular sieve membranes greatly enhances nucleation and growth of the molecular sieve membranes, and the molecular sieve membranes made in the invention are uniform and compact and have excellent gas separation performances; and the method has the advantages of mild operating conditions, easy industrial amplification, environmental protection and strong applicability.