Considering the design feature and requirement in high precision of geometric calibration of the earth annular ultraviolet (UV) limb imager, a new method based on UV collimator, high precision theodolite and six-dimension rotator is proposed. Geometric calibration is done as soon as the new device is built-up. The result shows an agreement of 2 pixel or less with the theoretical design in limb altitude and a biggest deviation of 25 pixel in limb azimuth orientation. The combined standard uncertainty analysis indicates a 0.488 pixel and a 0.612 pixel uncertainty in limb altitude and azimuth orientation respectively, both reaching sub-pixel precision. With the successful accomplishment of the geometric calibration, the method and the device offer an important reference and a realized platform for the pre-optic-mechanical installing and measuring of the similar type of instrument.