Method for synthesizing mesoporous molecular sieve with low water quantity and low template agent

The invention discloses a method for synthesizing a mesoporous molecular sieve with low water quantity and low template agent. The method comprises the following steps: (1) preparing a Y-type molecular sieve precursor; and (2) synthesizing the mesoporous molecular sieve by using a polyoxyethylene nonionic surfactant and an auxiliary block nonionic surfactant. A composite system composed of a polyoxyethylene nonionic surfactant/block nonionic surfactant is used as a template agent for synthesis of the mesoporous molecular sieve, when the polyoxyethylene nonionic surfactant is added into water, spatial configuration changes to form a large hydrophilic group, and meanwhile, due to hydrophilicity of hydroxyl and a C-O bond, the hydrophilic group can form a large hydrophilic group; the hydrophilicity of the mixed micelle is increased, so that the assembly between inorganic species and a template agent is facilitated, and the molecular sieve with good orderliness is obtained; in the process of synthesizing the meso