The invention discloses a power grid weather predicting and early-warning system based on a numerical weather prediction model. The power grid weather predicting and early-warning system comprises a numerical weather predicting system, a micrometeorological data collection system, an MOS predicting system and a weather predicting system, the micrometeorological data collection system is connected with the MOS predicting system, the numerical weather predicting system is connected with the MOS predicting system and the weather predicting system, the MOS predicting system is connected with the weather predicting system, and the weather predicting system is used for conducting predicting, early-warning, querying, counting and analyzing on weather phenomena of an area under administration and providing a visualized graph interface by taking data obtained by the numerical weather predicting system and data obtained by the MOS predicting system as bases. The power grid weather predicting and early-warning system based on the numerical weather prediction model has the advantage that quantitative prediction can be conducted automatically without relying on external numerical weather predictions.