The invention discloses a method for controlling grid-connected voltage of a photovoltaic power station based on area coordination. The method comprises the steps that: 1) area voltage control modeling is carried out, wherein the photovoltaic power station is modeled as a control unit similar to a conventional power plant unit; 2) the photovoltaic power station uploads the reactive power regulation capacity and the operating state in real time, receives a control instruction of a scheduling master station, and executes in a tracking mode; 3) master station AVC (automatic voltage control) scans grid operating data acquired by SCADA (supervisory control and data acquisition) in real time; 4) the master station AVC carries out operating condition decision making, and automatically selects power plants and busbars participating in calculation and control; 5) decision making is carried out on a center busbar according to the voltage state of a grid-connected point of the photovoltaic power station; 6) the area voltage control model is refreshed, and the reactive power regulation amount is coordinated according to the control sensitivity; and 7) a control strategy is solved through a quadratic programming algorithm, and the master station AVC gives out a high-voltage side busbar voltage target value to the power plant and a reactive power target value to the photovoltaic power station through an SCADA telecontrol channel. The method disclosed by the invention can carry out compensation and suppression on voltage fluctuation caused by photovoltaic grid connection.