Rack steel plate with thickness of 160mm for offshore wind power installation platform and manufacturing method of rack steel plate

The invention relates to a rack steel plate with the thickness of 160 mm for an offshore wind power installation platform and a manufacturing method of the rack steel plate. The steel plate is prepared from, by mass, 0.30%-0.40% of C, 0.15%-0.35% of Si, 0.85%-1.20% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.002% of S, 0.45%-0.75% of Cr, 0.45%-0.65% of Mo, 1.3%-1.8% of Ni, 0.06%-0.10% of Al, 0.02%-0.05% of V, 0.01%-0.04% of Nb, smaller than or equal to 0.006% of Ti, smaller than or equal to 0.007% of N, 0.001%-0.002% of B and the balance iron and inevitable impurity elements. The production thickness is smaller than or equal to 160 mm, the yield strength is larger than or equal to 1000 MPa, the tensile strength is larger than or equal to 1100 MPa, the ductility is larger than or equal to 12%, and the transverse Charpy impact energy at the 1/4 thickness position of the steel plate at-40 DEG C and the 1/2 thickness position of the steel plate at-30 DEG C is larger than or equal to Th