The invention provides a method for producing lead sulfate with electrochemical activity from waste lead-acid batteries, belonging to the field of waste lead-acid battery recycling chemical techniques. By optimizing the waste lead-acid battery recycling process, the ammonium carbonate is used as a desulfurizer of lead sulfate, and a series of reactions are carried out to convert the lead sulfate which loses the electrochemical activity in the waste lead-acid batteries into lead sulfate with electrochemical activity; and the ammonium sulfate, ammonium acetate, ammonium sulfate solution and the like obtained by reaction can be used as reaction raw materials for the subsequent batches. The process is simple and easy to implement and forms a closed circulation; the method does not generate low-value byproducts, conforms to the clean production requirements, greatly reduces the pollution risk, lowers the production cost, and provides a new feasible scheme for recycling and sustainable production of waste lead-acid batteries.