A low-alloy wear-resistant steel sheet having a Brookfield hardness of greater than 550 HB, comprising the following components in percentage by weight: 0.33-0.41% C, 0.50-0.60% Si, 0.30-0.80% Mn, less than or equal to 0.012% P, less than or equal to 0.003% S, 0.30-1.00% Cr, 0.20-0.60% Mo, 0.80-1.20% Ni, 0.008-0.030% Ti, 0.015-0.050% Nb, 0.080-0.150% V, 0.0008-0.0025% B, less than or equal to 0.0040% N, less than or equal to 0.0025% O, and the balance of Fe and inevitable impurities. The steel plate is designed with a medium to high level of carbon component and an alloying component. By using mutual synergy of alloying elements such as carbon, manganese, chromium, nickel, molybdenum, copper and the like and micro-alloying elements such as niobium, titanium, vanadium and the like supplemented by a method of controlled rolling and off-line heat treatment, the obtained steel plate has a Brookfield hardness of more than 550 HB and a low temperature impact toughness of greater than or equal to 20 J at -20 °C.
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