An electrolytic reduction module and a water purification device are provided. The electrolytic reduction module includes an electrode set, a first baffle, and a second baffle. The electrode set includes an anode, a first cathode, and a second cathode. The anode is disposed between the first cathode and the second cathode. The first cathode is disposed between the first baffle and the anode. The second cathode is disposed between the second baffle and the anode.