A non-aqueous electrolyte solution for a lithium secondary battery comprising: an ionizable lithium salt; an amide compound represented by the following Chemical Formula 1; a dinitrile compound including a hetero atom in a substituent bonded to the main chain; and an organic solvent, in Chemical Formula 1, R represents one selected from the group consisting of a halogen substituted alkyl group having 1 to 20 carbon atoms, a halogen substituted alkylamine group halving 1 to 20 carbon atoms, a halogen substituted alkenyl group having 2 to 20 carbon atoms and a halogen substituted aryl group having 6 to 12 carbon atoms, R1 and R2 independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkylamine group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms and an aryl group having 6 to 12 carbon atoms, at least one of R1 and R2 being an alkoxy group represented by -O(CH 2) p CH 3, and p being an integer of 0 to 8, and X represents one selected from the group consisting of carbon, silicon, oxygen, nitrogen, phosphor and sulfur, in which i) o represents 1 when X is the oxygen or the sulfur, ii) o represents 2 when X is the nitrogen or the phosphor, and iii) o represents 3 when X is the carbon or the silicon. an ionizable lithium salt; an amide compound represented by the following Chemical Formula 1; a dinitrile compound including a hetero atom in a substituent bonded to the main chain; and an organic solvent, in Chemical Formula 1, R represents one selected from the group consisting of a halogen substituted alkyl group having 1 to 20 carbon atoms, a halogen substituted alkylamine group halving 1 to 20 carbon atoms, a halogen substituted alkenyl group having 2 to 20 carbon atoms and a halogen substituted aryl group having 6 to 12 carbon atoms, R1 and R2 independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkylamine group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms and an aryl group having 6 to 12 carbon atoms, at least one of R1 and R2 being an alkoxy group represented by -O(CH 2) p CH 3, and p being an integer of 0 to 8, and X represents one selected from the group consisting of carbon, silicon, oxygen, nitrogen, phosphor and sulfur, in which i) o represents 1 when X is the oxygen or the sulfur, ii) o represents 2 when X is the nitrogen or the phosphor, and iii) o represents 3 when X is the carbon or the silicon. R represents one selected from the group consisting of a halogen substituted alkyl group having 1 to 20 carbon atoms, a halogen substituted alkylamine group halving 1 to 20 carbon atoms, a halogen substituted alkenyl group having 2 to 20 carbon atoms and a halogen substituted aryl group having 6 to 12 carbon atoms, R1 and R2 independently represent one selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkylamine group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms and an aryl group having 6 to 12 carbon atoms, at least one of R1 and R2 being an alkoxy group represented by -O(CH 2) p CH 3, and p being an integer of 0 to 8, and X represents one selected from the group consisting of carbon, silicon, oxygen, nitrogen, phosphor and sulfur, in which i) o represents 1 when X is the oxygen or the sulfur, ii) o represents 2 when X is the nitrogen or the phosphor, and iii) o represents 3 when X is the carbon or the silicon.