The invention discloses a voltage frequency adjustment method considering photovoltaic maximum power tracking for an active power distribution network. The voltage frequency adjustment method comprises the following steps of acquiring a reference voltage V of a photovoltaic cell in a maximum power running mode; acquiring a DC voltage V output from the photovoltaic cell; carrying out frequency adjustment on the DC voltage V to obtain a frequency adjustment quantity Delta Omega; calculating an average value P of active power and an average value Q of reactive power output from a photovoltaic inverter; calculating a droop coefficient of a self-adaptive droop control; obtaining a reference voltage amplitude U<*> and a reference angular frequency Omega' output from an AC side of the photovoltaic inverter after considering the self-adaptive droop control of a circuit impedance factor; obtaining a reference angular frequency Omega' after frequency adjustment; and calculating an input signal U of a pulse width modulation (PWM) driving circuit of the photovoltaic inverter. By the voltage frequency adjustment method, distributed photovoltaic maximum power can be ensured to be output, and meanwhile, the influence of the circuit impedance is considered; and when a load or an environment changes, active power and reactive power can be accurately allocated to the photovoltaic inverter, and the purpose of improving the reliability of distributed photovoltaic power supply is achieved.