The invention relates to a preparing method for a titanium alloy panel. An alloy comprises, by mass percentage, 4%-5% of Al, 1%-2% of Ni, 0.7%-0.8% of Cu, 0.5%-0.7% of V, 0.1%-0.2% of Bi, 0.1%-0.2% of Si, 0.07%-0.09% of In, 0.05%-0.06% of Ni, 0.03%-0.04% of Pd, 0.03%-0.04% of Pr, 0.01%-0.02% of Y and the balance titanium and titanium non-metallic inclusion; and the titanium alloy panel is obtained through ingot casting, annealing treatment, forging, hot rolling, cold rolling, quenching treatment and heat preservation. The intensity of the titanium alloy panel reaches more than 1200 MPa.