An electrolyte solution for a lithium-sulfur secondary battery comprising a lithium salt, a non-aqueous solvent and a cyclic anhydride compound, wherein the lithium salt is at least one selected from the group consisting of LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiB(Ph) 4, LiC 4 BO 8, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiAlCl 4, LiSO 3 CH 3, LiSO 3 CF 3, LiSCN, LiC(CF 3 SO 2) 3, LiN(CF 3 SO 2) 2, LiN(C 2 F 5 SO 2) 2, LiN(SO 2 F) 2 and lithium lower aliphatic carboxylate, wherein the non-aqueous solvent comprises a linear ether and a cyclic ether, the linear ether being selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, dibutyl ether, diisobutyl ether, ethylmethyl ether, ethylpropyl ether, ethyl tert-butyl ether, dimethoxymethane, trimethoxymethane, dimethoxyethane, diethoxyethane, dimethoxypropane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, tetra-ethylene glycol dimethyl ether, ethylene glycol divinylether, diethylene glycol divinylether, triethylene glycol divinylether, dipropylene glycol dimethyl ether, butylene glycol ether, diethylene glycol ethylmethyl ether, diethylene glycol isopropylmethyl ether, diethylene glycol butylmethyl ether, diethylene glycol tert-butylethyl ether, and ethylene glycol ethylmethyl ether; and the cyclic ether being selected from the group consisting of dioxolane, methyldioxolane, dimethyldioxolane, vinyldioxolane, methoxydioxolane, ethylmethyldioxolane, oxane, dioxane, trioxane, tetrahydrofuran, methyl tetrahydrofuran, dimethyl tetrahydrofuran, dimethoxy tetrahydrofuran, ethoxy tetrahydrofuran, dihydropyran, tetrahydropyran, furan and 2-methylfuran; and wherein the cyclic anhydride compound is represented by any one of Chemical Formula 1 to Chemical Formula 3: in Chemical Formula 1 to Chemical Formula 3, each of R is the same or different, and is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group. wherein the lithium salt is at least one selected from the group consisting of LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiB(Ph) 4, LiC 4 BO 8, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiAlCl 4, LiSO 3 CH 3, LiSO 3 CF 3, LiSCN, LiC(CF 3 SO 2) 3, LiN(CF 3 SO 2) 2, LiN(C 2 F 5 SO 2) 2, LiN(SO 2 F) 2 and lithium lower aliphatic carboxylate, wherein the non-aqueous solvent comprises a linear ether and a cyclic ether, the linear ether being selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, dibutyl ether, diisobutyl ether, ethylmethyl ether, ethylpropyl ether, ethyl tert-butyl ether, dimethoxymethane, trimethoxymethane, dimethoxyethane, diethoxyethane, dimethoxypropane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, tetra-ethylene glycol dimethyl ether, ethylene glycol divinylether, diethylene glycol divinylether, triethylene glycol divinylether, dipropylene glycol dimethyl ether, butylene glycol ether, diethylene glycol ethylmethyl ether, diethylene glycol isopropylmethyl ether, diethylene glycol butylmethyl ether, diethylene glycol tert-butylethyl ether, and ethylene glycol ethylmethyl ether; and the cyclic ether being selected from the group consisting of dioxolane, methyldioxolane, dimethyldioxolane, vinyldioxolane, methoxydioxolane, ethylmethyldioxolane, oxane, dioxane, trioxane, tetrahydrofuran, methyl tetrahydrofuran, dimethyl tetrahydrofuran, dimethoxy tetrahydrofuran, ethoxy tetrahydrofuran, dihydropyran, tetrahydropyran, furan and 2-methylfuran; and wherein the cyclic anhydride compound is represented by any one of Chemical Formula 1 to Chemical Formula 3: in Chemical Formula 1 to Chemical Formula 3, each of R is the same or different, and is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group.