Light driven actuators that reversibly change their shape and size in response to the light have been extensively studied for practical applications in remote controllable nano and information technology. Here, we report a novel main-chain photochromic liquid crystalline polymer {4-butoxy-2'-(4-hex-5-enyloxy)-4'-4(hex-5-enyl-oxybenzyloxy)azobenzene, abbreviated as MPLP} which shows excellent 3D bending behavior at room temperature. The liquid crystalline (LC) phase was investigated by the combined techniques of cross-polarized optical microscopy, differential scanning calorimetry, 1D and 2D wide angel X-ray diffraction with varying temperatures. The photo-activated deformation of this photochromic LC elastomer was investigated. Since the MPLP is a linear polymer without any chemical crosslinking, it was possible to process the polymer into a photoresponsive fiber or a film actuator. This work was mainly supported by BK21 PLUS Program, Basic Science Research Program (2013R1A1A2007238) and Converging Research Center Program (2013K001428), Korea. D.-Y. Kim appreciates the support from Global Ph.D Fellowship Program (2013H1A2A1033907) and K.-U. Jeong acknowledges the support from LG Yonam Foundation.