One aspect of the present invention relates to a clad steel plate having excellent strength and formability, comprising: a base metal; and a clad material provided on both sides of the base material, wherein the base metal is an austenitic high-manganese steel consisting of 0.3 to 1.4 wt.% of C, 12 to 25 wt.% of Mn, and the remainder being Fe and inevitable impurities, and wherein the clad material is martensitic carbon steel consisting of 0.09 to 0.4 wt.% of C, 0.3 to 4.5 wt.% of Mn, and the remainder being Fe and inevitable impurities.