This paper initially explores the wind field distribution characteristics in the area of transmission lines under the typical micro-topography environment of high mountain watersheds. With the rapid development of power grid construction, transmission lines cross various complex terrains inevitably. Transmission lines under micro terrains are prone to wind deviation accidents. Focuses on high mountain watershed typical micro terrains, a typical micro terrain calculation model is established, and the wind field distribution characteristics of the high mountain watershed typical micro terrains is simulated and analyzed using Fluent finite element software. The wind field distribution characteristics including trend of wind speed variation with terrain, location of the maximum wind speed, and ratio of maximum wind speed to incoming wind speed. The wind field variation law at different positions and heights above the ground of the mountain is obtained, and the calculation formula for wind speed correction coefficient at different positions is derived, and the calculation of theoretical wind speeds at different heights in high mountain watershed typical micro terrains can be achieved based on incoming wind speeds. So in practical applications, it is able to obtain wind speed values at the locations of transmission lines in typical micro terrains of high mountain watershed based on observational data. The Research achievements of this paper can provide basic data support for the wind-resistant design of transmission lines and the prediction of strong wind disaster risks. The research aims to improve the wind resistance design level of transmission lines and ensure the stable operation of the power grid.