The invention discloses a preparation method for a high-strength, high-plasticity and high-precision beta titanium alloy pipe. The preparation method comprises the steps that firstly, raw materials are mixed and pressed into electrode blocks, the electrode blocks are welded into an electrode, and the electrode is smelted into a beta titanium alloy ingot; secondly, the beta titanium alloy ingot issubjected to beta phase region cogging forging and thus a square billet is formed, after upsetting and drawing are conducted for three or more times, rounding is conducted and thus a bar billet is formed, and the bar billet is machined into an extruded pipe billet; thirdly, the extruded pipe billet is extruded and then subjected to solution treatment, cogging rolling and finish rolling are conducted, and thus a semi-finished beta titanium alloy pipe is obtained; and fourthly, the semi-finished beta titanium alloy pipe in the third step is subjected to solution treatment and aging treatment, then precision machining is conducted, and thus the beta titanium alloy pipe is obtained. The beta titanium alloy pipe prepared through the preparation method is uniform in alloy structure, fine in grain size, uniform in wall thickness and good in straightness, and the results of the mechanical properties of the beta titanium alloy pipe show that the beta titanium alloy pipe has high strength and high plasticity and meanwhile also has better size precision.