In order to accurately obtain the parameters of the photovoltaic inverter controller, accurate modeling of the photovoltaic system is realized in the simulation, so as to correctly analyze the dynamic performance of the photovoltaic grid-connected system. A parameter identification method of photovoltaic inverter controller based on real-time simulation hardware-in-the-loop test is proposed in the article. The dq axis parameter decoupling identification strategy based on particle swarm optimization is applied to this method. By building a photovoltaic inverter controller-real-time simulation hardware-in-the-loop test platform, the measured response data of the photovoltaic inverter under various working conditions is used as the measured data . After the accuracy of the identification strategy is verified by the rapid prototyping controller (RCP), hardware-in-the-loop experiments are performed on the actual controller using the platform, and a simulation model is established in Simulink based on the identification results to compare with the measured data.The results show that the proposed identification method can meet the requirements of correctness and effectiveness of power system transient simulation.