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Rechargeable zinc ion batteries (RZIBs) have gained significant attention due to their high safety, low cost, and environmental friendliness. However, the high reactivity of water in traditional aqueous electrolytes leads to the problems of dendrite formation and side reactions in the circulation process of zinc anode, which limits the development of RZIBs. These issues are effectively addressed by eutectic electrolytes through the regulation of the number of water molecules in the solvation structure of Zn2+ ions via hydrogen bonding and coordination effects. Additionally, eutectic electrolytes have the advantages of simple synthesis, non-corrosive, and environmental friendliness, which has attracted much attention in the field of RZIBs. The article begins by providing a brief introduction to the basic principles and definitions of eutectic electrolytes, and then highlights their current applications in RZIBs. Finally, the development prospects of eutectic electrolytes are discussed, offering important insights for the preparation of excellent eutectic electrolytes. [ABSTRACT FROM AUTHOR]