The invention discloses a control system of a wind-driven generator. The control system comprises a fixing bin, an environment temperature detector, an environment humidity detector, a heating device,a fan, an air delivery passage, a reflectivity detector and a controller. The air delivery passage is long-strip-shaped. The vertical side part of the air delivery passage is equipped with an air blowing opening. The upper part of the air blowing opening is located above a blade. The lower part of the air blowing opening is located below the blade. The reflectivity detector is used for detectingreflectivity of the middle part of the blade. The controller is used for controlling the fan and the heating device to work when environment temperature detected by the environment temperature detector goes down to or is below the reference temperature value and environment humidity detected by the environment humidity detector goes up to or is above the reference temperature value. The controlleris also used for controlling the fan and the heating device to continuously work when reflectivity detected by the reflectivity detector deviates from the reference reflectivity value. The control system detects environment temperature and humidity and determines the condition that the blade may get frozen. Through the air delivery passage, hot air is delivered for the blade, thereby preventing the blade from being frozen.