The invention discloses a wind turbine generator set blade icing state recognition method and device. The wind turbine generator set blade icing state recognition method comprises the steps that a lower limit value of the limited power rotating speed of a set is set; the current wind speed value and the current rotating speed value of the set are acquired and compared with a preset wind speed threshold value and a preset rotating speed threshold value, when the current wind speed value is larger than the preset wind speed threshold value, and the current rotating speed value of the set is smaller than the preset rotating speed threshold value, the blade icing possibility index is progressively increased, and if not, the blade icing possibility index is progressively decreased; and when theicing possibility index is larger than a preset index, the situation that blades are iced is determined. The preset rotating speed threshold value is smaller than the lower limit value of the limitedpower rotating speed and larger than the smallest rotating speed value of the set. The wind turbine generator set blade icing state recognition method achieves blade icing state recognition under thelimited power condition and the normal running condition, and especially achieves blade icing state recognition under the conditions of the high wind speed and serious blade stalling and the condition that the blades bear the high ice load.