A sliding spotlight laser-imaging SAR is characterized in that the sliding spotlight laser-imaging SAR comprises a laser-imaging SAR which is composed of an optical emission system and an optical receiving system; the optical receiving system is provided with a mechanism used for eliminating echo wave face aberration and the optical emission system is provided with a phase quadratic-term biasing mechanism controlled by lighting facula; the laser-imaging SAR moves in a straight line and the optical emission system emits an emission signal beam with a certain divergency during the moving to form an optical track with a certain diameter on the plane of a measured object and the focused imaging zone in the plane of the measured object is scanned by the optical track at a slow speed; the emission signal beam and a heterodyne receiving FOV are concentric and the beam divergency is equal to the angle of the heterodyne receiving FOV.