Preparation method of sodalite zeolite membrane

The invention provides a method for preparing a sodalite zeolite membrane, specifically comprising the following steps of: preparing a liquid precursor for membrane formation according to the mol ratio of SiO2: (0.65-1)Al2O3: (0.25-0.5)K2O: (0.02-0.35)Na2O: (42-75)H2O: (5-11)[emim]Br; vertically putting a metal base material which is prepared beforehand into the crystallization liquid precursor; and synthesizing the sodalite zeolite membrane in a microwave reactor at the crystallization temperature of 50-90 DEG C for the crystallization time of 60-150 min. The benefit of the invention is that the continuous compact sodalite zeolite membrane is synthesized under the microwave ionothermal condition. The method is carried out in an open system, and the membrane formation process and the materials are both green and environmentally friendly. The synthetic membrane is resistant to high temperature, acid-base corrosion and bioerosion, and has a good application prospect in the aspect of metal anticorrosion.