The photovoltaic (PV) generation system is significantly affected by external environmental disturbances, its intermittent and fluctuating characteristics can easily cause impact on the power grid. In order to reduce the impact of PV systems on the power grid, this paper proposes a maximum power point tracking (MPPT) controller based on linear active disturbance rejection control (LADRC) can enhance the system’s robustness to external disturbances and system parameter uncertainty. The experimental results show that the system has superior performance in both dynamic response and steady-state performance and can significantly improve the overall efficiency and stability of the photovoltaic power generation system.