The present disclosure provides a method and an apparatus for photovoltaic power forecast based on numerical weather prediction. The method includes: determining a historical key weather feature matrix and a prediction key weather feature matrix; determining a historical weather data matrix and a prediction weather data matrix; determining a historical input matrix and a prediction input matrix; combining the historical input matrix and the prediction input matrix; performing singular value decomposition on the combined input matrix to obtain a principal component feature matrix; determining K principal component features corresponding to K historical time periods having the nearest Manhattan distances with the prediction time period; acquiring a fitting relationship according to the K principal component features and K photovoltaic powers corresponding to the K historical time periods; inputting the principal component feature corresponding to the prediction time period to the fitting relationship to obtain a photovoltaic power.