The invention discloses a nano mesoporous molecular sieve material and a synthesis method thereof, which belong to the technical field of the preparation and application of nano molecular sieve materials. In the method, a common silicon source, an aluminum source and cetyl trimethyl ammonium bromide serving as a surfactant are taken as raw materials for synthesizing a mesoporous molecular sieve, the pH value of a reaction mixture is adjusted by ammonia water, and a nano mesoporous molecular sieve nano-AlKIT-1 is synthesized by a hydrothermal synthesis method. The invention has the advantages that: the synthesis method is simple, organic salt and an organic solvent are not required to be added in the synthesis process, and the pH value of the reaction mixture is repeatedly adjusted in the crystallization process.