The invention provides a hierarchical distributed photovoltaic access power distribution network voltage control system and method. The system comprises a feed line voltage controller and local voltage controllers. Each local voltage controller is directed to a local photovoltaic power station. The feed line voltage controller is directed to the whole feed line and coordinates and controls each local voltage controller on the feed line. If the local voltage controller cannot solve the local voltage off-limit problem, the local voltage controller uploads the operation state of the local photovoltaic power station to the feed line voltage controller to which the local voltage controller belongs, and the feed line voltage controller calculates the control amount and issues the control instruction according to electrical information uploaded by the local voltage controller. According to the instruction sent by the feed line voltage controller, the local voltage controller calculates the control amount of the local area, and controls reactive power output of a local reactive power compensator and a local photovoltaic inverter, so to achieve voltage off-limit control in the feed line area. The voltage off-limit problem caused by the photovoltaic access is solved, and the power distribution network voltage distribution meets engineering operation requirements.