Processing and preparing method for high-strength high-precision Ti6Al4V titanium alloy tube

The invention discloses a processing and preparing method for a high-strength high-precision Ti6Al4V titanium alloy tube. The processing and preparing method comprises the following steps of: forginga Ti6Al4V titanium alloy bar billet with a uniform and fine tissue, adopting a box type resistance furnace to heat and preserve heat for the titanium alloy bar billet in a beta-phase area; rolling theheated titanium alloy bar billet into a tube billet through an oblique-rolling perforating machine; performing thermal treatment on the rolled bar billet, and performing thermal straightening by a straightening machine; and performing boring treatment on the inner surface of the thermally straightened tube billet, thereby obtaining the finished product titanium alloy tube. Through control on titanium alloy chemical components, especially interstitial elements O and Fe, large-deformation forging and rolling, reasonable heating and rolling temperature selection during processing and follow-up stress-relief annealing, th