The invention relates to a high-temperature-resistant 400 HB wearproof steel plate. The high-temperature-resistant 400 HB wearproof steel plate is prepared from chemical components including 0.15%-0.25% of C, 0.10%-0.40% of Si, 0.8%-1.30% of Mn, 0.010%-0.040% of Nb, 0.030%-0.060% of V, smaller than or equal to 0.010% of Ti, 0.03%-0.06% of Al, smaller than or equal to 0.1% of Ni, smaller than or equal to 0.1% of Cu, 0.10%-0.50% of Cr, 0.50%-1.00% of Mo, 0.001%-0.005% of B, 0.0010%-0.0050% of Ca, smaller than or equal to 0.010% of P, smaller than or equal to 0.0015% of S, smaller than or equal to 0.0015% of O, smaller than or equal to 0.0035% of N, smaller than or equal to 0.0002% of H, larger than or equal to 0.55 or smaller than or equal to 0.65 of the carbon equivalent CEV and the balanceFe and inevitable impurity elements, wherein CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. In a production process, controlled cooling is carried out after rolling is completed, grains are refined, and fine Martensite lathes are obtained for following offline quenching. High-temperature tempering is adopted after quenching is completed, under the combined effect of Cr/Mo/V precipitates, it is guaranteed that the microstructure of the high-performance performance finished steel plate of the steel plate is uniform tempered sorbite, and the grains are fine; and the size is smaller than or equal to 20 micrometers, fine uniform precipitates are dispersed on a ferrite matrix, and the precipitates are carbide.