The present disclosure provides a spaceborne multi-channel synthetic aperture radar imaging device, the plurality of paths of elevation-directional receiving antenna assemblies are arranged equidistantly in elevation direction of the multi-channel SAR imaging system; each of the plurality of paths of elevation-directional receiving antenna assemblies receives a radar echo, and generates a path of elevation-directional echo data; the echo data received by the plurality of paths of elevation-directional receiving antenna assemblies forms a path of echo signal after passing through the elevation-directional digital beam forming unit, a plurality of paths of elevation-directional receiving antennas corresponding to the path of echo signal serve as a column of receiving antennas; the plurality of columns of azimuth-directional receiving antenna assemblies are arranged in azimuth direction of the multi-channel SAR imaging system; each column of azimuth-directional receiving antenna assemblies receives radar echoes, and outputs a path of azimuth-directional echo data, wherein the plurality of columns of azimuth-directional receiving antenna assemblies generate a plurality of paths of echo signals after passing through respective digital beam forming unit, and the plurality of paths of echo signals enter the azimuth-directional spectrum reconstruction unit to implement azimuth-directional spectrum reconstruction; the azimuth-directional spectrum reconstruction unit, with its input ends connected respectively with output ends of the plurality of paths of elevation-directional digital beam forming units, is configured to perform azimuth-directional spectrum reconstruction on echo signals outputted from the digital beam forming units, generate and output a SAR echo signal; and the imaging device, with its input end connected with the output end of the azimuth-directional spectrum reconstruction unit, is configured to receive the SAR echo signal and generate a SAR image from the SAR echo signal.
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