Photovoltaic grid-connected cabinets are used at the back end of string inverters or AC combiner boxes in solar photovoltaic power generation systems, so that the electricity generated by the photovoltaic project can be directly connected to the grid or for personal use. The surface of the cabinet is equipped with multi-functional instruments that can be passed through 485 communication connects to the background, indicator lights, opening and closing buttons, independent measurement room and observation room.