The invention discloses a preparation method of a wear-resistant steel plate. The preparation method comprises the following steps: 1) mixing, 2) sintering, and 3) casting heating and crystallization. Compared with the prior art, the preparation method has the following advantages: with the adoption of a special raw material ratio, the produced wear-resistant steel plate is high in performance index, good in glossiness and stability, and high in overall density and surface density, and is not prone to break, and the dimensional precision, production efficiency, die life and cost problems of the existing precision protection steel plate are solved.