The invention provides a method and apparatus for evaluating the damping ratio recognition accuracy of a power transmission tower. The method comprises the following steps: calculating the number of damping ratio recognition value samples of the power transmission tower according to a preset collection time and collection frequency; determining an allowable error range of a damping ratio recognition value according to the number of the damping ratio recognition value samples; determining a space of the damping ratio recognition value samples of the power transmission tower according to the number of the damping ratio recognition value samples; determining the damping ratio recognition accuracy of the power transmission tower according to the space of the damping ratio recognition value samples and the allowable error range of the damping ratio recognition value; and comparing the damping ratio recognition accuracy with preset accuracy, and if the damping ratio recognition accuracy is greater than the preset accuracy, determining that the number of the damping ratio recognition value samples satisfies precision requirements. By adoption of the method for evaluating the damping ratio recognition accuracy of the power transmission tower provided by the invention, the damping ratio recognition accuracy of the power transmission tower is evaluated accurately, and theoretical basis is provided for accurate calculation of dynamic load of transmission lines.