The invention discloses an airborne SAR high-resolution tomography method. The method comprises the following steps: acquiring a two-dimensional SAR image; registering the two-dimensional SAR image toobtain a registered two-dimensional SAR image; performing phase error correction on the registered two-dimensional SAR image to obtain a two-dimensional SAR image after phase correction; obtaining atarget pixel point and a coordinate of the target pixel point in a geocentric earth-fixed coordinate system from the two-dimensional SAR image after phase correction; constructing an imaging grid in the elevation direction according to the target pixel points and the coordinates; finding out homonymous pixel points from the two-dimensional SAR image after phase correction according to the imaginggrid in the elevation direction and the target pixel points; and performing focusing imaging according to the target pixel points and the homonymous pixel points to obtain a three-dimensional SAR image. According to the invention, tomography is carried out on different navigations, so that the problem of serious deterioration of elevation direction sidelobes when vertical effective baselines are distributed unevenly is solved, and the defect of inaccurate declination during elevation direction focusing is also avoided, so that high-resolution tomography is realized.