We reveal a photo-induced control of ferroelectricity in hybrid-improper ferroelectric superlattices, using ab-initio theory. Along with a notable photostriction effect, thermalized carriers from photo-excitation affect octahedral tiltings along different directions. A trilinear coupling between antipolar and tilting modes drives corresponding cationic displacements, and this results in a decrease in polarization under light. Together with recent experimental evidences, our study therefore demonstrates that light is a viable route to engineer functionalities in materials.