The invention relates to a method for preparing a hierarchical porous SAPO-11 molecular sieve by using templating agent P123-containing SBA-15 as a silicon source. The method comprises the following steps: uniformly mixing P123, deionized water, the silicon source and acid, putting an obtained gel-like mixture into an autoclave for crystallizing, and washing, filtering and drying a solid product to obtain the templating agent P123-containing SBA-15; uniformly mixing deionized water, a phosphorus source, an aluminum source, a templating agent and the templating agent P123-containing SBA-15 to obtain a mixed solution; putting the mixed solution into a polytetrafluoroethylene reaction kettle, and putting into a crystallization reaction oven for crystallizing; separating, washing, drying and roasting the solid product to obtain the hierarchical porous SAPO-11 molecular sieve. The hierarchical porous SAPO-11 molecular sieve synthesized by the method has a relatively large surface area and a relatively large mesopore volume.