Using three meteorological factors such as temperature, average wind speed, relative humiditymeasured by automatic weather station in real - time as the basic parameters, the critical meteorological index for freezing and melting of wind sensor in automatic weather station was established. The wind - driven sensor antifreezing heating device was controlled for automatic operation through the PC - RS232 communication interface, ATmega8 - based single - chip and op toelectronic isolation circuit, which would realize the goal of the wind sensor antifreezeing p rotection in automatic weather station.