The invention relates to a power transmission conductor galloping amplitude measurement method. According to the power transmission conductor galloping amplitude measurement method, a measurement device composed of a small-sized remote control unmanned aerial vehicle (1) and a small-sized high-definition image pickup instrument (2) which has cross scale marks and is installed at the bottom of the small-sized remote control unmanned aerial vehicle (1) is utilized to realize multi-azimuth and multi-angle observation of the galloping form of a power transmission conductor (3). With the power transmission line galloping amplitude measurement method adopted, an optimal position can be selected, so that the galloping amplitude of the power transmission conductor can be measured at the position, and a measurement angle and the conductor are located at the same horizontal plane; the images of the highest point and the lowest point of the galloping of the conductor can be obtained accurately; a conversion method is simpler; the defects of limited measurement angles and complex conversions methods in existing methods can be eliminated; measurement results can be more accurate and effective; the measurement results can provide data support for follow-up galloping prevention and control work; and safe and stable operation of a power grid can be ensured.