The invention is applicable to the technical field of power transmission line safety and provides power line icing monitoring method and terminal equipment. The method incudes: acquiring the image information, collected by an image collecting device, of a power line and the angle information, collected by an angle collecting device, of the power line, wherein the angle information comprises the included angle between the lead of the power line and a horizontal plane; analyzing according to the image information to obtain the first thickness value of power line icing, and analyzing according to the angle information to obtain a second thickness value of the power line icing; if the difference between the first thickness value and the second thickness value is smaller than or equal to a preset error threshold, using the average value of the first thickness value and the second thickness value as a thickness monitoring value. The method has the advantages that the thickness of the power line icing is monitored through image processing and angle detection, the errors of icing thickness monitoring can be reduced, and monitoring accuracy can be increased.