A non-aqueous electrolyte for a lithium secondary battery according to the present invention comprises a lithium salt, an organic solvent, and a first additive, wherein the first additive contains a compound represented by chemical formula 1. [Chemical formula 1] (In chemical formula 1, R1 is a substituted or unsubstituted unsaturated hydrocarbon group of 2 to 20 carbon atoms; and R2 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group of 1 to 10 carbon atoms, and a substituted or unsubstituted cyclic alkyl group of 3 to 8 carbon atoms.)