The invention discloses a method for smelting a steel plate with the excellent performance in a high-heat-input-welding heat affected zone. The method sequentially includes the steps of molten steel pretreatment, combined-blowing converter steelmaking, LF refining, RH vacuum refining, alloy cored wire feeding and continuous casting. According to the method, the content of oxygen in molten steel and the adding conditions of key alloy materials at key stations are controlled, the content of Ti, the content of O, the content of Mg and the content of Zr in the steel meet the design requirements accordingly and can meet the conditions that Ti/O is larger than 5 and smaller than 12, (Mg+Zr)/(Ti+Al) is larger than 0.02, and one or two kinds of a large quantity of Ti-Mg composite-oxide inclusions, a large quantity of Ti-Zr composite-oxide inclusions and a large quantity of Ti-Mg-Zr composite-oxide inclusions with the size smaller than 1 micron are contained in the steel accordingly; in addition, the mass percents of chemical compositions of the inclusions meet the conditions that the mass percent of Ti is larger than 2% and smaller than 40%, the mass percent of Mg is larger than 2% and smaller than 30%, the mass percent of Zr is larger than 2% and smaller than 30%, and the mass percent of O is larger than 5% and smaller than 50%; and the areal density is larger than 300 per mm<2>. Due to the inclusions, growth of austenite crystal grains of the welding heat affected zone can be effectively pinned; and meanwhile nucleus forming of needle-shaped ferrite in the grains is promoted, and therefore the excellent performance in the high-heat-input-welding heat affected zone is guaranteed.