A clad steel plate, having excellent strength and formability, comprising: a base material; and cladding materials provided on both side surfaces of the base material, wherein the base material is austenitic high-manganese steel comprising, by weight, 0.3% to 1.4% of C, 12% to 25% of Mn, 0.03% to 2.0% of Si, 0.02% to 2.5% of Al, 0.04% or less of N, excluding 0%, 0.03% or less of P, and 0.03% or less of S, and a remainder of Fe and inevitable impurities, the cladding materials are martensitic carbon steels comprising, by weight, 0.09% to 0.4% of C, 0.3% to 4.5% of Mn, 0.03% to 1.0% of Si, 0.02% to 0.3% of Al, 0.04% or less of N, excluding 0%, 0.0005% to 0.005% of B, 0.03% or less of P, and 0.03% or less of S, and a remainder of Fe and inevitable impurities, wherein optionally the austenitic high-manganese steel further comprises, by weight, one or more of 0.01% to 0.5% of Ti, 0.0005% to 0.005% of B, 0.05% to 1.0% of Mo, 0.2% to 3.0% of Cr, 0.01% to 0.5% of Nb, and 0.05% to 0.7% of V, wherein optionally the martensitic carbon steel further comprises, by weight, one or more of 0.1 to 1.0% of Cr, 0.1% to 1.0% of Ni, 0.05% to 1% of Mo, 0.005% to 0.05% of Ti, and 0.005% to 0.05% of Nb, wherein a thickness of the base material is 30% to 90% of a thickness of the clad steel plate, wherein yield strength is 700 MPa or more, and a product of tensile strength and elongation is 25,000 MPa% or more, wherein a microstructure of the austenitic high-manganese steel is an austenite single phase, and wherein a microstructure of the martensitic carbon steel has 65 area% or more of martensite or tempered martensite having an acicular structure, and the remainder comprises one or more of retained austenite, ferrite, bainite, and carbide. a base material; and cladding materials provided on both side surfaces of the base material, wherein the base material is austenitic high-manganese steel comprising, by weight, 0.3% to 1.4% of C, 12% to 25% of Mn, 0.03% to 2.0% of Si, 0.02% to 2.5% of Al, 0.04% or less of N, excluding 0%, 0.03% or less of P, and 0.03% or less of S, and a remainder of Fe and inevitable impurities, the cladding materials are martensitic carbon steels comprising, by weight, 0.09% to 0.4% of C, 0.3% to 4.5% of Mn, 0.03% to 1.0% of Si, 0.02% to 0.3% of Al, 0.04% or less of N, excluding 0%, 0.0005% to 0.005% of B, 0.03% or less of P, and 0.03% or less of S, and a remainder of Fe and inevitable impurities, wherein optionally the austenitic high-manganese steel further comprises, by weight, one or more of 0.01% to 0.5% of Ti, 0.0005% to 0.005% of B, 0.05% to 1.0% of Mo, 0.2% to 3.0% of Cr, 0.01% to 0.5% of Nb, and 0.05% to 0.7% of V, wherein optionally the martensitic carbon steel further comprises, by weight, one or more of 0.1 to 1.0% of Cr, 0.1% to 1.0% of Ni, 0.05% to 1% of Mo, 0.005% to 0.05% of Ti, and 0.005% to 0.05% of Nb, wherein a thickness of the base material is 30% to 90% of a thickness of the clad steel plate, wherein yield strength is 700 MPa or more, and a product of tensile strength and elongation is 25,000 MPa% or more, wherein a microstructure of the austenitic high-manganese steel is an austenite single phase, and wherein a microstructure of the martensitic carbon steel has 65 area% or more of martensite or tempered martensite having an acicular structure, and the remainder comprises one or more of retained austenite, ferrite, bainite, and carbide. <EOS>