The invention relates to a multimethod-fused downscaling analysis system and method for meteorological elements of power transmission lines. The multimethod-fused downscaling analysis system comprisesa comprehensive forecasting device, a terrain-complexity closest-grid-point forecasting device and a dynamic integration device, wherein the comprehensive forecasting device is used for calculating acomprehensive forecasting value and sending the forecasting value to a dynamic integration module; the terrain-complexity closest-grid-point forecasting device is used for calculating a forecasting value by a terrain-complexity closest method and sending the forecasting value to the dynamic integration module; the dynamic integration device is used for receiving the forecasting values sent by thecomprehensive forecasting device and the terrain-complexity closest-grid-point forecasting device and calculating a dynamic integration forecasting value. The multimethod-fused downscaling analysis system and method have the beneficial effects that starting from the characteristics of a gridding numerical forecasting product, the meteorological elements of a small area or certain specified pointare accurately predicted by the downscaling technology, so that high-definition weather forecasting information of the power transmission lines can be obtained.