The invention discloses a dynamic voltage regulation test method of a photovoltaic power station for inverter phase modulation. According to the relevant technical requirements of GB/T 29321-2012 "Technical Specifications of Reactive Power Compensation for Photovoltaic Power Station ", a test of the dynamic voltage regulation capability of a photovoltaic power station is carried out based on threecontrol modes of constant power factor, constant reactive power and constant voltage of the photovoltaic power station according to dynamic monitoring and oscillographic analysis of a grid-connectedpoint voltage and reactive power; and a maximum adjustable range, adjustment accuracy, a response speed, and the like are tested. With the dynamic voltage regulation test method, the capability of participating in the dynamic voltage regulation and reactive power control of the photovoltaic power station by the inverter phase modulation can be utilized fully; a solution is provided for the power generation reactive power control test technology of the new energy; and the rapid support effect for the voltage and reactive power by the phase modulation control of the inverter can be verified effectively.