The invention discloses a photovoltaic power generation system maximum power tracing device. The device comprises a solar photovoltaic component, a current transformer, a voltage transformer and a maximum power tracing solar controller, wherein the input end of the current transformer and the input end of the voltage transformer are both connected with the solar photovoltaic component, the output end of the current transformer and the output end of the voltage transformer are connected with the maximum power tracing solar controller, the maximum power tracing solar controller is connected with a power output module through a power driving module, and the power output module is connected with a load. The device is simple in structural principle, high in intelligence degree, high in control precision, and capable of achieving photovoltaic power generation maximum power tracing, improving power conversion efficiency and reducing electric energy consumption.