The invention relates to a three-section wind turbine generator system yawing method and system with high wind-energy capturing rate. The method comprises the following steps: when the wind speed is higher than a cut-in wind speed and lower than a first preset wind speed, the smallest yawing error angle is controlled in a range of +-15 degrees, wherein the first preset wind speed is lower than a rated wind speed and higher than the cut-in wind speed; when the wind speed is higher than the first preset wind speed and lower than a second preset wind speed, a wind speed tracking control policy isadopted to reduce the smallest yawing error angle along with increment of the wind speed, wherein the second preset wind speed is higher than the rated wind speed and lower than a cut-out wind speed;and when the wind speed is higher than the second preset wind speed and lower than the cut-out wind speed, the smallest yawing error angle is calculated based on a generator power, and yawing is stopped when a generator set is fully loaded to run. The method can increase the fan wind energy utilization rate caused by the yawing system under the precondition of reducing the equipment loss.