The present invention relates to an alloy vessel plate and a production method thereof; the main components of the vessel plate are controlled as the following targets by weight percentage: 0.15-0.17 percent of C, 0.2-0.3 percent of Si, 0.4-0.6 percent of Mn, 0.8-1.0 percent of Cr, 0.45-0.55 percent of Mo, 0.02-0.04 percent of Al, and the remaining is Fe and unavoidable impurities. The alloy pressure vessel plate and the production method thereof are particularly suitable for 15CrMOR smelting, billet heating, rolling cooling and heat treatment normalizing and tempering production technologies, after the technologies are adopted, the production cost is low, machine hour yield is high, the toughness and weld simulation performances of the final products are good, thereby reducing the production cost and meeting the using requirements of the products.