The invention discloses a high-strength high-elasticity copper-titanium alloy and a manufacturing method thereof. The copper-titanium alloy comprises the following components in percentage by mass: 2.3%-3.8% of Ti, less than or equal to 0.3% of Ni, less than or equal to 0.3% of Fe, less than or equal to 0.1% of Y, less than or equal to 0.1% of La and the balance of Cu and inevitable impurity elements, wherein the sum of Cu and Ti is greater than or equal to 99.3%. The manufacturing method comprises the steps of vacuum smelting, plate blank casting, hot rolling for a strip, cold rolling, solid solution treatment, aging, finish rolling and the like. The high-strength high-elasticity copper-titanium alloy and the manufacturing method thereof have the following beneficial effects: through the vacuum smelting, a vacuum high-temperature smelting environment is provided, so that active titanium element in the alloy is strictly controlled, the contents of hydrogen, oxygen, nitrogen, inclusions and the like in the prepared copper-titanium alloy are low, the purity of the copper-titanium alloy is high, and gas, impurities and non-metallic inclusions are removed in a refining process for copper and titanium metal, so that the quality of the prepared copper-titanium alloy is improved; and the problems of long production process for the copper-titanium alloy strip and low yield are solved, and shorter process for producing the copper-titanium alloy strip and higher efficiency are achieved, so that large-scale production is facilitated.