The invention relates to a photovoltaic power station reactive voltage control system and method based on inverter mixed response. The control system comprises an upper layer AVC control system and alower layer local controller; an AVC system is mounted in a photovoltaic power station monitoring center; the local controller is mounted in a photovoltaic inverter; the local controller is connectedwith the AVC system through an internal communication network of the photovoltaic power station; the upper layer AVC control system can response the second-level reactive requirement of the photovoltaic power station by controlling the photovoltaic inverter response; and the lower layer local controller can suppress the millisecond-level voltage fluctuation of the photovoltaic power station by controlling the inverter. The inverters in the photovoltaic power station are divided into steady-state reactive type photovoltaic inverters and transient-state reactive type photovoltaic inverters, so that the functions of second-level steady-state reactive voltage control and millisecond-level transient-state voltage fluctuation suppression of the photovoltaic power station can be realized by adopting the photovoltaic inverter through coordination control of the AVC system. By virtue of the photovoltaic power station reactive voltage control system and method, the problem of control difficultybetween small-amplitude impact reactive requirement and high-amplitude fluctuation reactive requirement in the photovoltaic power station can be solved effectively.