The present invention relates to a method for warning waving of power transmission channels. The method comprises: collecting and sorting related information of important power transmission channels and related data of ice coating caused waving of power transmission lines; simulating high-resolution meteorological elements according to the information and data; predicting a waving severity trend according to prediction of the meteorological elements; building a finite element model of the lines inside the important power transmission channels according to the information, stimulating an operating state of the important power transmission channels according to the prediction of the meteorological elements, and predicting a waving damage trend by using the finite element model and the operating state; and determining a waving warning according to the predicted waving severity trend and the predicted waving damage trend. The technical scheme provided by the present invention provides a technical support for the safe and stable operation of the important power transmission channels.