The invention discloses a method for recycling waste lead-acid batteries and belongs to the technical field of battery recycling to solve the problem in the prior art that a large amount of sodium sulfate cannot be fully recycled. The recycling method of the application comprises the following steps of: punching a waste lead-acid battery and pouring an acid solution out of the waste lead-acid battery; crushing and separating the waste lead-acid battery with the acid solution poured out to obtain a molded case, separator paper, a grid, a lead part and lead paste; processing and recycling the molded case, the separator paper, the grid, the lead part and lead paste; desulfurizing and filtering the lead paste to obtain the lead paste and a filtrate, washing the lead paste to neutrality, and mixing the filtrate and a washing solution to obtain a mixed solution; subjecting the mixed solution to a homogeneous-phase bipolar membrane treatment to convert sodium sulfate in the mixed solution into sodium hydroxide and dilute sulfuric acid; and calcining the washed lead paste to prepare anode lead oxide powders. The method can be used for recycling waste lead-acid batteries.