Hexagonal petal SAPO-5 zeolite was synthesized by ionothermal method with high efficiency under the conditions of microwave heating power of 400W, temperature of 180 °C and crystallization time of 20 min, in which a low-dosage eutectic mixture based on succinic acid, choline chloride and tetraethyl ammonium bromide was used as the solvent and template, nanosheets SAPO-5 molecular sieve synthesized by hydrothermal method acted as seeds.The product phase, morphology, pore structure and acidity of the synthesized samples were fully analyzed by XRD, SEM, N2 physical adsorption/ desorption and NH3-TPD techniques. The results of N2 physical adsorption/desorption analysis show that the synthesized sample SC2-T180-t20-P400 is a hierarchically porous SAPO-5 molecular sieve with micro-meso-macropore structure inside, and its external surface area is up to 85 m2/g.The atomic utilization efficiency of inorganic substances in zeolite products can reach 88%. Most importantly, the conversion of benzyl alcohol and the selectivity of diphenylmethane in the alkylation of benzene with benzyl alcohol reached 99.9% and 93.9% respectively, showing better catalytic performance than the traditional hydrothermally synthesized counterpart.