A highly corrosion-resistant plated steel sheet comprising: a base steel sheet; and a plating layer comprising an Fe-AI alloy layer and an MgZn 2 layer sequentially from an interface with the base steel sheet, wherein the Fe-AI alloy layer has a thickness of 1 μm to 8 μm, wherein the MgZn 2 layer has a thickness of 0.5 to 3.5 μm, wherein a proportion of the MgZn 2 phase directly on an Fe-AI alloy phase in the plating layer is 90% or more, where the proportion is determined as a ratio of an area of the MgZn 2 phase to an overall area when a layer, formed to be higher than MgZn 2, is removed and observed, wherein the plating layer further includes an Al alloy layer above the MgZn 2 layer, wherein the plating layer includes 3 to 10% of an Mg 2 Si phase, based on an area, where a ratio of the Mg 2 Si phase is determined as a ratio of an area of the Mg 2 Si phase to an overall area of the plating layer when the plated steel sheet is cut and observed, wherein an area ratio of an Mg 2 Si phase in contact with the base steel sheet is 2% or less. where a ratio of the Mg 2 Si phase is determined as a ratio of an area of the Mg 2 Si phase to an overall area when a layer, formed to be higher than Mg 2 Si, is removed and observed, wherein a mean of lengths of major axes of MgZn 2 phase is 3 to 6μm, wherein a ratio of an area of the Mg 2 Si phase in contact with Fe-Al to an area of the base steel sheet is 2% or less, wherein the plating layer has a composition including, by weight, 5 to 10% of Si, 5 to 30% of Zn, and 1 to 7% of Mg, optionally 0.5% or less of Be and Sr in total, the balance being Al and inevitable impurities, and wherein Fe and Al is 70% or more in the Fe-AI alloy. a base steel sheet; and a plating layer comprising an Fe-AI alloy layer and an MgZn 2 layer sequentially from an interface with the base steel sheet, wherein the Fe-AI alloy layer has a thickness of 1 μm to 8 μm, wherein the MgZn 2 layer has a thickness of 0.5 to 3.5 μm, wherein a proportion of the MgZn 2 phase directly on an Fe-AI alloy phase in the plating layer is 90% or more, where the proportion is determined as a ratio of an area of the MgZn 2 phase to an overall area when a layer, formed to be higher than MgZn 2, is removed and observed, wherein the plating layer further includes an Al alloy layer above the MgZn 2 layer, wherein the plating layer includes 3 to 10% of an Mg 2 Si phase, based on an area, where a ratio of the Mg 2 Si phase is determined as a ratio of an area of the Mg 2 Si phase to an overall area of the plating layer when the plated steel sheet is cut and observed, wherein an area ratio of an Mg 2 Si phase in contact with the base steel sheet is 2% or less. where a ratio of the Mg 2 Si phase is determined as a ratio of an area of the Mg 2 Si phase to an overall area when a layer, formed to be higher than Mg 2 Si, is removed and observed, wherein a mean of lengths of major axes of MgZn 2 phase is 3 to 6μm, wherein a ratio of an area of the Mg 2 Si phase in contact with Fe-Al to an area of the base steel sheet is 2% or less, wherein the plating layer has a composition including, by weight, 5 to 10% of Si, 5 to 30% of Zn, and 1 to 7% of Mg, optionally 0.5% or less of Be and Sr in total, the balance being Al and inevitable impurities, and wherein Fe and Al is 70% or more in the Fe-AI alloy.