The utility model relates to a wind-electricity transformer which is provided with an over-voltage protection screen, comprising an iron core, a low voltage coil and a high-voltage coil; the wind-electricity transformer is characterized in that the wind-electricity transformer also comprises a protection screen which is arranged between the high-voltage coil and the low-voltage coil; the protection screen covers the external surface of the low voltage coil and encircles the low-voltage coil by one circle; furthermore, the front and the end of the protection screen are overlapped with each other; an insulation layer is arranged between the two overlapped layers. When the over-voltage of instant mutation occurs to the high-voltage power network of the wind-electricity system, the protection screen can prevent the low voltage coil of the wind-electricity transformer, a wind power generator AC winding and a low voltage control system which are connected with the low voltage coil from being invaded by the over-voltage, and ensures the safe running of the wind-electricity transformer, the wind power generator and the low voltage control system.