Super-thick steel plate for container ships and preparation method of super-thick steel plate

The invention discloses a super-thick steel plate for container ships, which comprises the following components in percentage by weight: 0.04-0.12% of C, 0.25-0.50% of Si, 1.00-1.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0020% of S, 0.20-1.0% of Ni, 0.020-0.040% of Nb, 0.020-0.060% of V, 0.015-0.025% of Ti, 0.020-0.050% of Alt, and the balance of Fe and unavoidable impurities. The super-thick steel plate is prepared through the following production steps of molten iron pretreatment, BOF (basic oxygen furnace) steelmaking, LF (ladle refining) refining, RH (ruhrstahl heraeus) vacuum treatment, continuous casting, and TMCP (thermal mechanical control processing), the structure of an obtained super-thick steel plate for container ships comprises acicular ferrites, granular bainites and a small amount of pearlites, and the structure is uniform and small. The super-thick steel plate disclosed by the invention is simple in production process and low in cost, and has good lamellar tearing resistance, brittle crack preventing properties, high strength and high toughness.