The invention relates to a photovoltaic power generation system employing a virtual grounding technology. The system comprises M photovoltaic inverters which are parallelly connected to generate power. The output ends of all photovoltaic inverters are connected with the input end of a same isolation transformer; the input end of each photovoltaic inverter is connected with at least one solar panel. The system is characterized in that an isolation direct-current voltage source used for increasing voltage applied to the ground by a cathode of the current photovoltaic inverter is connected between a cathode of only one photovoltaic inverter and the ground, among the M photovoltaic inverters; or an isolation direct-current voltage source used for decreasing the voltage applied to the ground by an anode of the current photovoltaic inverter is connected between the anode of only one photovoltaic inverter and the ground, among the M photovoltaic inverters. A solution to Potential induced attenuation of solar panels is provided for the photovoltaic power generation system with the multiple parallel photovoltaic inverters, the problem that unit performance decrease caused by PID (plasma-induced charging damage) effect can be effectively prevented, and the system is simple, feasible and low in cost.