A method for producing a multicomponent metal oxide catalyst having a perovskite lattice structure, the method comprising: a step of mixing and stirring a first metal precursor, citric acid, and ethylene glycol at a molar ratio of 0.1: 0.4: 0.9 in distilled water in a temperature range of 50 to 90°C, thereby preparing a first mixture solution; a step of mixing and stirring a titanium precursor and a second metal precursor in anhydrous ethanol in a temperature range of 50 to 90°C, thereby preparing a second mixture solution; a reaction step of mixing the first mixture solution and the second mixture solution, followed by stirring in a temperature range of 50 to 90°C for about 24 hours; a step of removing the solvent through a drying step after the reaction step; a first calcination step of calcining a solid-state material, obtained through the drying step, in a temperature range of about 300 to 400°C under an oxygen atmosphere; and a second calcination step of calcining the solid-state material in a temperature range of about 800 to 1,000°C under an oxygen atmosphere after the first calcination step, wherein the ratio of the sum of the moles of Ti and the second metal, which are contained in the titanium precursor and the second metal precursor, respectively, to the moles of the first metal contained in the first metal precursors, is maintained at 1:1, so that the second metal in ionic form is substituted in the perovskite (ABO 3) lattice structure, wherein the first metal precursor is strontium nitrate, magnesium nitrate, calcium nitrate or barium nitrate, and wherein said multicomponent metal oxide having the perovskite (ABO 3) structure is MgTiOs, CaTiOs, BaTiOs or SrTiOs, and Ni in ionic form is substituted at the Ti site (B-site) of the MgTiOs, CaTiOs, BaTiOs or SrTiOs, wherein in said multicomponent metal oxide catalyst all Ni 2+ are located in the lattice structure, and wherein the catalyst is represented by the following formula: Formula MTi 1-x Ni x O 3-δ (wherein x is 0 < x < 0.05, δ is 0 < δ < 0.10, M is Sr, Mg, Ca or Ba). a step of mixing and stirring a first metal precursor, citric acid, and ethylene glycol at a molar ratio of 0.1: 0.4: 0.9 in distilled water in a temperature range of 50 to 90°C, thereby preparing a first mixture solution; a step of mixing and stirring a titanium precursor and a second metal precursor in anhydrous ethanol in a temperature range of 50 to 90°C, thereby preparing a second mixture solution; a reaction step of mixing the first mixture solution and the second mixture solution, followed by stirring in a temperature range of 50 to 90°C for about 24 hours; a step of removing the solvent through a drying step after the reaction step; a first calcination step of calcining a solid-state material, obtained through the drying step, in a temperature range of about 300 to 400°C under an oxygen atmosphere; and a second calcination step of calcining the solid-state material in a temperature range of about 800 to 1,000°C under an oxygen atmosphere after the first calcination step, wherein the ratio of the sum of the moles of Ti and the second metal, which are contained in the titanium precursor and the second metal precursor, respectively, to the moles of the first metal contained in the first metal precursors, is maintained at 1:1, so that the second metal in ionic form is substituted in the perovskite (ABO 3) lattice structure, wherein the first metal precursor is strontium nitrate, magnesium nitrate, calcium nitrate or barium nitrate, and wherein said multicomponent metal oxide having the perovskite (ABO 3) structure is MgTiOs, CaTiOs, BaTiOs or SrTiOs, and Ni in ionic form is substituted at the Ti site (B-site) of the MgTiOs, CaTiOs, BaTiOs or SrTiOs, wherein in said multicomponent metal oxide catalyst all Ni 2+ are located in the lattice structure, and wherein the catalyst is represented by the following formula: Formula MTi 1-x Ni x O 3-δ (wherein x is 0 < x < 0.05, δ is 0 < δ < 0.10, M is Sr, Mg, Ca or Ba).