Why electrolytic zinc sulfate is not electrolytic water?

Because electrolyte is anode and zinc sulfate is cathode. According to the query, official website of Shanghai Nonferrous Network shows.

1. Electrolyte is anode and zinc sulfate is cathode. Electrolytic zinc sulfate is equivalent to electrolytic water, which is a process in which hydrogen ions gain electrons and hydroxyl groups lose electrons. Electrolytic zinc sulfate is also a hydrogen ion reaction.

2. Zinc is the positive electrode, iron is the negative electrode, the positive electrode loses electrons, and zinc ions enter the solution, so it is a zinc ion reaction.