Method for preparing powder metallurgy titanium alloy bar

The invention discloses a method for preparing a powder metallurgy titanium alloy bar. The method comprises the following steps: by taking Ti powder and alloy element powder as raw materials, sufficiently and uniformly mixing the Ti powder and the alloy element powder, and putting the mixed powder into an isostatic cool pressing sleeve for isostatic cool pressing treatment, thereby preparing a crude bar blank; performing vacuum sintering on the prepared crude bar blank, and performing furnace cooling, thereby preparing a sintered bar blank; and performing low-temperature thermoplastic deformation treatment on the prepared sintered bar blank, thereby obtaining the powder metallurgy titanium alloy bar with a large height-diameter ratio, wherein the alloy element powder comprises one or more of Al, V, Mo, Fe, Mn, Zr and intermediate alloy powder of the above elements, and the mass ratio of the alloy element powder is controlled to be within 15%. The method disclosed by the invention is low in cost, small in investment and good in product property, and the powder metallurgy titanium alloy bar can be used for manufacturing high-performance fasteners.