The invention belongs to the field of catalyst synthesis and in particular relates to a preparation method of a hierarchical porous ZSM-5 molecular sieve. The preparation method comprises the following steps: 1) mixing an alkali source, an aluminum source and water to obtain mixed liquor A; 2) stirring and mixing an anionic surfactant, a dispersing agent and water to obtain mixed liquor B; 3) mixing the mixed liquor A and the mixed liquor B to obtain mixed liquor C; 4) mixing the mixed liquor C, a silicon source and ZSM-5 crystal seeds to obtain mixed liquor D; 5) crystallizing the mixed liquor D at the temperature of 140-180 DEG C, drying, and then washing; and 6) roasting a product obtained after washing in the step 5) at the temperature of 500-600 DEG C, so that the hierarchical porous ZSM-5 molecular sieve is obtained. The preparation method provided by the invention has the advantages that the hierarchical porous ZSM-5 molecular sieve with a hierarchical porous structure and high dispersibility can be simply and successfully synthesized, and life of the hierarchical porous ZSM-5 molecular sieve in MTA reaction is prolonged.