The invention discloses a method for verifying aerodynamic damping of a power transmission line under deicing vibration in combination with a reduced scale test. The method is implemented by the following steps of building a simulated reduced scale deiced power transmission line physical model and an actual power transmission line software model according to an actual power transmission line; building a reduced scale power transmission line software model; importing a motion equation of longitudinal vibration of the reduced scale power transmission line to obtain a vibration air resistance expression of the reduced scale power transmission line; and importing an air resistance energy consumption expression E in a unit cycle to obtain a vibration equivalent damping expression F of the reduced scale power transmission line and a vibration equivalent damping ratio expression G of the reduced scale power transmission line, and performing verification. The method has the beneficial effectsthat by utilizing an aerodynamic damping parameter, numerical simulation calculation of the deicing vibration of the power transmission line can be performed, so that a numerical simulation calculation result of the deicing vibration of the power transmission line is more accurate.