The control of DC voltage synchronization has always been a major challenge in microgrid systems, as it directly affects the communication and energy transfer efficiency between microgrids. This article proposes a photovoltaic new energy based photovoltaic voltage control method for DC microgrids, aiming to improve the synchronization performance of DC voltage. By adopting a distributed collaborative control strategy and optical communication isolation technology, a linear optical communication secondary regulator based on integration is introduced to achieve synchronous control of output voltage and derivative. By introducing global performance indicators, voltage ripple and steady-state error were effectively reduced, and their effectiveness was verified in experiments. The voltage synchronization error of the local microgrid was reduced. The synchronization error of adjacent microgrids was minimized. The interaction between DC-DC buck converters were transfered from the physical layer to the communication layer. The simulation experiment results show that under input voltage disturbances, this method has good voltage synchronization performance, voltage ripple elimination ability, and voltage convergence speed, highlighting the important role of optical communication technology in photovoltaic new energy DC microgrids.