The invention relates to a method for assisted synthesis of a molecular sieve by means of ultraviolet radiation, which belongs to the technical field of synthesis of the molecular sieve. The method comprises the steps of measuring a silicon source, an aluminum source and other reactants, transferring the silicon source, the aluminum source and other reactants into a quartz container, carrying out the crystallization reaction at a given reaction temperature by means of ultraviolet radiation (power density of 20 to 80 w / m<2>), washing and drying a crystallization product, and obtaining an A-type, X-type, N-type, Silicalite-1-type, Beta-type, Y-type, ZSM-5-type, MOR-type or SAPO-34-type molecular sieve. By adopting the method, the silicon-aluminum molecular sieve with good crystallization can be rapidly obtained, compared with the traditional method, the alkality and temperature of the reactant can be reduced to a certain extent, and the synthesis process of the molecular sieve can be accelerated. The production cost is greatly reduced, and the industrial application prospect is promising.