The invention discloses a method for rolling and forming TC11 titanium alloy thin-walled rings, which is used for rolling and forming thin-walled rings with high size precision and good organization and performance. The method comprises the following steps: firstly, nesting a pre-rolled titanium alloy billet which is heated to a deformation temperature and a preheated follow-up die sleeve into a ring rolling mill, and positioning the two workpieces by a main roller, a core roller, a holding roller, an upper cone roller and a lower cone roller of the ring rolling mill, wherein the follow-up die sleeve is nested in the pre-rolled billet; and then, starting up the ring rolling mill to enable the core roller to make a feed motion radially towards the direction of the main roller and roll the pre-rolled billet together with the main roller by the rolling force of 200KN-4000KN under the support of the follow-up die sleeve, so that the width of the pre-rolled billet is expanded radially at a speed of 5-10mm/s, the wall thickness of the pre-rolled billet is gradually reduced, and after the deformation of the pre-rolled billet reaches 25%-45%, the pre-rolled billet is rolled into a thin-walled ring. The minimum value of the wall thickness of the titanium alloy thin-walled ring rolled by the method is 25 mm, and the maximum value of the height-to-thickness ratio thereof is 25 mm. The ring is mainly used for components of revolved bodies such as cylindrical shells and the like used in the fields of aviation and the like.