The invention provides a hierarchical pore SAPO-34 molecular sieve synthesis method which is characterized in that an aluminum source, a silicon source, a phosphorus source, an organic template agentand water are mixed and added into a hydrothermal reactor, and in-situ synthesis is performed to form an SAPO-34 molecular sieve with hierarchical pores. According to the hierarchical pore SAPO-34 molecular sieve synthesis method, a hierarchical pore structure can be formed without acid or alkali post-treatment process or addition of other components, raw material cost and subsequent separation steps are reduced, industrial amplifying production is facilitated, substance diffusion and heat conduction in methanol-to-olefin reaction are facilitated by formation of the hierarchical pores, and theservice life of the molecular sieve is greatly prolonged.