The combiner box has AC combiner box and DC combiner box, which is a wiring device to ensure the orderly connection and confluence function of photovoltaic modules in the photovoltaic power generation system. The device can ensure that the photovoltaic system is easy to cut off the circuit during maintenance and inspection, and reduce the scope of power outage when the photovoltaic system fails. Combiner box means that users can connect a certain number of photovoltaic modules with the same specifications in series to form a photovoltaic series, and then connect a number of photovoltaic series in parallel to the photovoltaic combiner box, and after the confluence in the photovoltaic combiner box, through the controller, DC distribution cabinet, photovoltaic inverter, AC distribution cabinet, supporting the use to form a complete photovoltaic power generation system, and realize grid connection with the mains. It is widely used in houses, solar farms, and solar pumped water storage systems.