The invention discloses a wind generating set yaw control system and method. The wind generating set yaw control system comprises a first yaw controller, a second yaw controller, a fan operation condition monitoring sensor, a yaw driver, a yaw position sensor, and a yaw position counter. The fan operation condition monitoring sensor comprises an electric generator rotating speed sensor, a power sensor and a wind speed sensor, the fan operation condition monitoring sensor and the yaw position sensor are connected with the input end of the first yaw controller, the wind speed sensor is connectedwith the input end of the second yaw controller and the input end of the first yaw controller, and the output end of the first yaw controller and the output end of the second yaw controller are connected with the control signal input end of the yaw driver. The first yaw controller is used for controlling the yaw driver to achieve fan yaw, when the wind speed super large condition appears, a fan can continuously run, support can be provided for reducing possible large-area cut out of a wind driven generator under the high wind speed, and impact of wind and power field force output sudden changes to a power grid can be avoided.