The invention provides a high-performance Ti alloy and a preparation method thereof. The high-performance Ti alloy comprises the following chemical elements in percentage by weight: 0.08-0.12% of C, 0.3-0.5% of Si, 0.1-0.5% of O, 2-5% of W, 1.5-3.5% of Mn, 3.0-5.0% of Cr, 1.0-1.6% of Co, 0.3-0.8% of B, 0.15-0.25% of V, 2.5-4% of Al, 0.1-0.5% of N, 6.5-10% of Sn, 3-5% of Te, 0.08-1.25% of Mo, 0.40% or less of Ni and Ti in balancing amount. The high-performance Ti alloy provided by the invention has the characteristics of relatively low density, high specific strength, good corrosion resistance, good stability, excellent mechanical properties, good hydrolysis resistance property, high precision, low cost and the like, and has a very wide application prospect as a high-performance Ti alloy material in the fields of automobiles, chemical engineering, electricity, aerospace and the like.