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The application relates to the field of batteries and discloses a solid-state electrolyte precursor and a lithium metal battery. The solid-state electrolyte precursor is characterized in that the solid-state electrolyte precursor comprises a ternary eutectic solvent, an ether monomer, a fluorine ether diluent and a lithium salt; the ternary eutectic solvent comprises lithium bistrifluoromethylsulfonylimide, a Lewis acid and a Lewis base; and the molar ratio of the lithium bistrifluoromethylsulfonylimide and the Lewis acid is 1:0.01-5. The solid-state electrolyte precursor contains a specific ternary eutectic solvent, a lithium metal battery containing a deep eutectic solid-state electrolyte obtained by in-situ polymerization of the solid-state electrolyte precursor has good interface stability, the generation of lithium dendrites is inhibited, the lithium metal cycle stability is high, and the safety performance is more excellent.