The invention provides a power transmission line corridor environment fire danger class evaluation method. According to the method, a woodland fire danger class nearby a power transmission corridor is determined according to a plurality of satellite remote sensing data, real-time meteorological essential factor monitoring data of a ground weather station and the ground vegetation coverage information, four fire danger factors of the power transmission corridor vegetation woodland coverage ratio V, the rainfall to fire danger class influence factor R, the TVDI index to fire danger grade influence factor M and the landform to fire danger class influence factor T are comprehensively utilized, quantitative parameter guidance is provided for power transmission corridor area safety fire prevention monitoring on different areas in different seasons through fusion and superposition of multiple fire danger factors.