The invention provides a wind energy and solar energy automatic switching electric power sign board. A photovoltaic battery array is connected with a photovoltaic rectifier through a wire; a wind turbine is connected with a fan rectifier through a wire; a storage battery is connected with the photovoltaic rectifier, the fan rectifier and an inverter through wires separately; the inverter is connected with a light sensation detector, a microprocessor and a sign board switch through wires separately; the light sensation detector, the microprocessor and the sign board switch are connected in sequence through a signal line; and the sign board switch is connected with an isolation switch sign board, a circuit breaker sign board, a terminal box sign board, a current transformer sign board, a voltage transformer sign board, an earthing knife switch sign board, a main transformer sign board and a capacitor sign board separately through wires. The wind energy and solar energy automatic switching electric power sign board has the beneficial effects as follows: the wind energy and solar energy automatic switching electric power sign board has an illumination function, so that working staff can see sign boards clearly at night; the sign board switch can be automatically switched on or switched off at night or in day time; clean solar energy and wind energy are utilized and transformer power supply is not occupied; and meanwhile, the wind energy and solar energy automatic switching electric power sign board is creative and novel in design and practical.