A
beam shaping method and device employing full-
image transfer for planar light sources (11, 12, 13, 14). The method comprises: using multiple first lenses (21, 22, 23, 24) to respectively magnify and image beams emitted by multiple planar light sources (11, 12, 13, 14), so as to obtain magnified full images (31, 32, 33, 34) of the multiple planar light sources (11, 12, 13, 14); and seamlessly stitching together the magnified full images (31, 32, 33, 34) of the multiple planar light sources (11, 12, 13, 14) at a primary imaging position (30), so as to obtain a seamless
light source (S) at the primary imaging position (30). The
beam shaping method for the planar light sources (11, 12, 13, 14) achieves the
elimination of gaps between the light sources with almost no loss of
optical power by means of full-
image transfer and seamless stitching, thereby improving the beam quality of the light sources as a whole. This kind of optical shaping method is suitable for shaping and
processing planar light sources (11, 12, 13, 14) such as VCSEL and LED.