The invention relates to the field of material heat treatment, and discloses a low alloy high tenacity Q-P-T wear-resistant steel plate and a manufacturing method thereof. The low alloy high tenacityQ-P-T wear-resistant steel plate comprises, by mass, 0.2-0.4% of C, 0.1-0.5% of Si, 0.5-1.5% of Mn, 0.5-1.2% of Cr, 0.1-0.3% of Mo, 0.02-0.08% of Ni, 0.04-0.1% of Cu, 0.001-0.008% of V, 0.01-0.04% ofTi, 0.01-0.05% of Nb, 0.001-0.003% of B, less than 0.015% of P, less than 0.005% of S, less than 0.006% of N, and the balance Fe and inevitable impurities. The low alloy high tenacity Q-P-T wear-resistant steel plate adopts the technique of Q-P-T heat treatment to manufacture the high tenacity wear-resistant steel. Microstructures are martensite, bainite, and retained austenite. Microalloy elements of V, Ti and Nb have effects of fine grain strengthening and precipitation strengthening. Therefore, the wear-resistant steel is good in abrasion performance, and high in tenacity.