The invention provides a micro-area wind speed estimation method for a power transmission line. The method comprises the following steps of constructing a three-dimensional wind field based on acquired weather radar monitoring data and historical monitoring data of a micro-meteorological monitoring system; and based on the three-dimensional wind field and a preset wind profile equation, correctingthe weather radar monitoring data by using wind measuring data in the historical monitoring data of the micro-meteorological monitoring system to obtain wind speed information of any elevation of a measured point of a micro-area of the power transmission line. According to the technical scheme, based on historical wind measuring data of a micro-meteorological monitoring device of the power transmission line, a high-rise wind speed inversion product of a Doppler radar is corrected downwards by using a statistical method, so that wind speed change information of the elevation where the power transmission line is located is obtained and necessary real-time wind speed monitoring information is provided for power grid typhoon disaster prevention and emergency measure research.