The invention relates to a photovoltaic power generation system model parameter identification test method. According to the test method, a power grid disturbance simulator is accessed before Internet access of a photovoltaic power generation system; on the precondition of not influencing operation of a power grid, collection of operating data is finished when the photovoltaic power generation system breaks down; during wiring test, output of a grid-connected unit inverter of the photovoltaic power generation system is firstly stopped; a test system is connected in series to an Internet access line of the photovoltaic power generation system; after AC output and boost, the photovoltaic inverter is connected in series to an incoming circuit breaker of the test system and is accessed to a power grid disturbance simulator after step-down by a step-down transformer; the power grid disturbance simulator simulates different types of single-phase, two-phase and three-phase grid faults and grid system frequency faults; voltage is recovered to the Internet access voltage level by a boosting transformer; and the photovoltaic power generation system is accessed to the power grid after passing through an Internet access circuit breaker. The method provided by the invention can provide accurate photovoltaic power generation system model parameter identification basis in the normal and fault states of the power grid.