The utility model discloses a photovoltaic electricity equipment screen cabinet automatic switching warning sign, concretely relates to power equipment technical field. This photovoltaic electricity equipment screen cabinet automatic switching warning sign, power supply system including automatically controlled connection, automatic change -over holds with showing, be equipped with the dc -to -ac converter between automatic change -over and the power supply system, power supply system includes array of photovoltaic cells and battery, array of photovoltaic cells's output even has the photovoltaic rectifier, automatic change -over includes insulating casing, the last opening that is equipped with of insulating casing, be equipped with the spring in the insulating casing, two terminals of a state terminal and state, be equipped with the current conducting plate directly over the spring, the current conducting plate up end even has the insulator spindle, the insulator spindle stretches out insulating casing through the opening, show that a state demonstration end is drawn together to the hand ladle and state no. 2 shows the end, wherein a state terminal shows with state no. 1 that the end links to each other, two terminals of state show with state no. 2 that the end links to each other.