The invention discloses a synthesis method of an HZSM-5 molecular sieve adopting a dual template agent. The synthesis method comprises the steps that a silicon source, an aluminum source, a template agent, seed crystal and water are mixed in proportion and uniformly stirred to form gel; the gel is dried and ground into powder; the powder is crystallized in a reaction kettle containing water at the bottom; and a crystallized product is dried and calcined to obtain the product. The method does not use a raw material containing sodium ions, saves traditional ammonium exchange, washing and calcination processes, avoids separation of the product and mother liquid in the traditional crystallization technology, does not use expensive organic amine as the template agent, and has the characteristics of low cost, small waste liquid quantity, high yield and the like.