The invention belongs to the technical field of chemical industry, and relates to comprehensive utilization of fly ash. The invention provides a method for producing P-type zeolite from fly ash acid sludge. The method comprises the following steps: putting fly ash acid sludge into an alkali solution to dissolve out silicon and aluminum, then adjusting the molar ratio of the silicon to the aluminum in the dissolved solution, crystallizing, filtering, washing and drying to obtain the P-type zeolite. The method is mild in reaction condition, simple in production process and low in production cost.