The invention discloses a method for manufacturing a TC25 titanium alloy ring piece. A TC25 titanium alloy pre-rolled compact is heated to the deformation temperature of 30-50 DEG C below a phase transformation point, upsetting is carried out to enable the TC25 titanium alloy pre-rolled compact to be deformed by 50%-60% to obtain a solid cylinder, punching is carried out on the solid cylinder to enable the size of the inner diameter of the hole of the solid cylinder to be 60%-70% of the size of the outer diameter of the hole of the solid cylinder, a hollow cylinder is obtained, then mandrel supporter hole broadening is carried out, the size of the inner diameter of the hole of the hollow cylinder is made to be 70%-75% of the size of the outer diameter of the hole, a final forging temperature>=850 DEG C, the hollow cylinder is melted down when the hollow cylinder is hot, and heat preservation time is halved as is calculated with an actual thickness of 6min/10mm. Final rolling is carried out, the size of the inner diameter of the hole of the hollow cylinder is made to be 85%-90% of the size of the outer diameter of the hole, and a final rolling temperature >=850 DEG C. At last, double annealing processing is carried out, and the TC25 titanium alloy ring piece is obtained. The reasonable deformation temperature is adopted, and forging is facilitated. Air cooling is adopted after the forging, cooling is accelerated, the cooling process of air cooling is adopted in the double annealing process, and the mechanical performance of a forge piece is greatly improved.