A high-hardness wear-resistant steel plate comprising: by weight%, 0.10 to 0.32% of carbon, 0.1 to 0.7% of silicon (Si), 0.6 to 1.6% of manganese (Mn), 0.05% or less, excluding 0%, of phosphorus, 0.02% or less, excluding 0%, of sulfur, 0.07% or less, excluding 0%, of aluminum (Al), 0.1 to 1.5% of chromium (Cr), 0.01 to 2.0% of nickel (Ni), 0.01 to 0.8% of molybdenum (Mo), 50 ppm or less, excluding 0, of boron, and 0.005% to 0.04% of cobalt (Co), the wear-resistant steel: plate further comprising one or more of 0.5% or less, excluding 0%, of copper (Cu), 0.02% or less, excluding 0%, of titanium (Ti), 0.05% or less, excluding 0%, of niobium (Nb), 0.05% or less, excluding 0%, of vanadium, and 2 to 100 ppm of calcium (Ca), further optionally comprising one or more of 0.05% or less, excluding 0%, of arsenic (As), 0.05% or less, excluding 0%, of tin (Sn), and 0.05% or less, excluding 0%, of tungsten, and comprising a remainder of iron (Fe) and other unavoidable impurities, and satisfying Relational expression 1: t (V_M97) < 0.55HI, where t (V_M97) is a thickness of a steel plate having a microstructure in which a martensite fraction is 97% or more in a center region of the steel: plate in a thickness direction, and HI is a hardenability index determined by an alloying element and is represented by a component relationship: HI = 0.54 × (0.73[Si]+1) × (4.12 [Mn]+1) × (0.36[Cu]+1) × (0.41[Ni]+1) × (2.15[Cr]+1) × (3.04[Mo]+1) × (1.75 +1) × (0.12[Co]+1) × 33, in which each element refers to a weight content, wherein a microstructure includes martensite having an area fraction of 97% or more and bainite of 3% or less, wherein the steel: plate has a thickness of 40 mm to 130 mm. by weight%, 0.10 to 0.32% of carbon, 0.1 to 0.7% of silicon (Si), 0.6 to 1.6% of manganese (Mn), 0.05% or less, excluding 0%, of phosphorus, 0.02% or less, excluding 0%, of sulfur, 0.07% or less, excluding 0%, of aluminum (Al), 0.1 to 1.5% of chromium (Cr), 0.01 to 2.0% of nickel (Ni), 0.01 to 0.8% of molybdenum (Mo), 50 ppm or less, excluding 0, of boron, and 0.005% to 0.04% of cobalt (Co), the wear-resistant steel: plate further comprising one or more of 0.5% or less, excluding 0%, of copper (Cu), 0.02% or less, excluding 0%, of titanium (Ti), 0.05% or less, excluding 0%, of niobium (Nb), 0.05% or less, excluding 0%, of vanadium, and 2 to 100 ppm of calcium (Ca), further optionally comprising one or more of 0.05% or less, excluding 0%, of arsenic (As), 0.05% or less, excluding 0%, of tin (Sn), and 0.05% or less, excluding 0%, of tungsten, and comprising a remainder of iron (Fe) and other unavoidable impurities, and satisfying Relational expression 1: t (V_M97) < 0.55HI, where t (V_M97) is a thickness of a steel plate having a microstructure in which a martensite fraction is 97% or more in a center region of the steel: plate in a thickness direction, and HI is a hardenability index determined by an alloying element and is represented by a component relationship: HI = 0.54 × (0.73[Si]+1) × (4.12 [Mn]+1) × (0.36[Cu]+1) × (0.41[Ni]+1) × (2.15[Cr]+1) × (3.04[Mo]+1) × (1.75 +1) × (0.12[Co]+1) × 33, in which each element refers to a weight content, wherein a microstructure includes martensite having an area fraction of 97% or more and bainite of 3% or less, wherein the steel: plate has a thickness of 40 mm to 130 mm.