The invention relates to NV-F690 ultrahigh strength ship plate steel and a manufacture method thereof. The ship plate steel takes Fe as the substrate, and comprises the following components (wt%): 0.03-0.05% of C, 0.10-0.35% of Si, 0.50-1.60% of Mn, 0.02-0.05% of Nb, 0.009-0.02% of Ti, 1.00-1.70% of Cu, less than or equal to 0.70% of Cr, 0.8-2.0% of Ni, 0.01-0.04% of Al, 0.1-0.6% of Mo, less than or equal to 0.020% of P, less than or equal to 0.010% of S and impurities. The method is as follows: sequentially carrying out heating, insulating, hot rolling, cooling and heat treatment on continuously cast blooms with the same components as the above-mentioned ship plate to form the finished ship plate steel. The ship plate steel obtained according to the invention has yield strength of more than 690MPa and good low temperature impact toughness, and is suitable for applications in the manufacture field of ships and offshore oil platforms.