The invention discloses a distribution network pivot point voltage regulation method and system based on a distributed photovoltaic power generation system. The voltage regulating method comprises thefollowing steps of: collecting the bus voltage of 380V of the distribution network of the distributed photovoltaic power generation system in real time; When the bus voltage of 380V is greater than the voltage threshold, the timing is started; and when the bus voltage of 380V is greater than the voltage threshold, the timing is started. Obtaining the current season when the timing time is greaterthan the time threshold; Acquiring a reactor within a corresponding preset capacity range according to the current season; Shunt reactor on the 10 kV bus at the central point; Judging whether the reduced 380V bus voltage acquired in real time exceeds the limit; When the reduced 380V bus voltage exceeds the limit, the reactor parameters are adjusted until the reduced 380V bus voltage does not exceed the limit. Stop regulating the bus voltage of 380V. Under the fluctuation of the photovoltaic output of the distributed photovoltaic power generation system, the voltage regulation method of the invention adopts an active distribution network power flow calculation method to analyze the bus overvoltage situation of the distribution network, and finally realizes the dynamic regulation of the busvoltage of the central point.