The invention relates to an electrolytic tank heating system capable of meeting different temperature rising magnitude requirements. According to the technical scheme, the electrolytic tank heating system comprises at least two electrolytic tanks with different temperature rising magnitude requirements, a first heat supply subsystem for heating the electrolytic tank high in temperature rising magnitude requirement through a first heat conduction medium, and a second heat supply subsystem for heating the electrolytic tank low in temperature rising magnitude requirement through a second heat conduction medium; the heat conduction efficiency of the first heat supply subsystem is higher than that of the second heat supply subsystem; and the first heat supply subsystem relatively high in heat conduction efficiency heats the electrolytic tank high in temperature rising magnitude requirement through the first heat conduction medium, the second heat supply subsystem heats the electrolytic tank low in temperature rising magnitude requirement through the second heat conduction medium, and accordingly, the temperature control precision requirements of the electrolytic tanks with the different temperature rising magnitude requirements are met.