The invention provides a composite wear-resistant steel plate with good ductility and toughness, and a manufacturing method thereof. The upper wear-resistant layer of the steel is composed of the following chemical components in percentage by weight: 0.13% to 0.22% of C, 0.15% to 0.50% of Si, 1.0% to 1.50% of Mn, not more than 0.005% of S, not more than 0.02% of P, 0.0% to 0.50% of Cr, 0.18% to 0.25% of Mo, 0.015% to 0.03% of Ti, 0.0010% to 0.0020% of B, 0.03% to 0.05% of Als, and the balance being Fe and inevitable impurities; and the lower basic layer comprises the following chemical components in percentage by weight: 0.13% to 0.20% of C, 0.15% to 0.50% of Si, 0.8% to 1.70% of Mn, not more than 0.005% of S, not more than 0.02% of P, 0% to 0.050% of Nb, 0% to 0.2% of V, 0% to 0.03% of Ti, and the balance being Fe and inevitable impurities. The manufacturing method comprises following steps: welding the upper continuous casting slab and the lower continuous casting slab together, then rolling, wherein the rolling temperature is not lower than 1000 DEG C, and the reduction rate of the first three rolling processes is 10% to 25%; thermally leveling the integrated slab after the rolling process, piling up, slowly cooling down, simultaneously carrying out a offline thermal treatment on the wear-resistant layer and the basic layer after the cooling process, wherein the wear-resistant layer is on the top and the basic layer is on the bottom; carrying out a quenching treatment on the wear-resistant layer, and carrying out an air-cooling and normalizing treatment on the basic layer. The steel plate has the advantages of low alloy content, long service life, uniform performance, good ductility and toughness, and completeness in specifications. Moreover, the steel can be produced through automatic production lines, and thus the production efficiency is improved.