The invention provides a method for verifying stability of a titanium alloy precise optical support structure. The method comprises the following steps: carrying out optical measurement and three-coordinate measurement of the optical support structure to obtain position data of the titanium alloy precise optical support structure before carrying out mechanical vibration test; then carrying out optical measurement and three-coordinate measurement of the optical support structure again after carrying out mechanical vibration test to obtain position data; comparing data results before vibration and after vibration to determine whether the stability of the precise optical support structure meets the requirement on the camera imaging quality or not, and determining that the stability meets therequirement when the data results of optical measurement and three-coordinate measurement meet the requirement on the camera imaging quality. The method is applied to test verification of the stability of the optical support structure with the requirements of large size, variable cross sections, high stability and high rigidity in the space optical remote sensor.