The invention provides a solar energy resource evaluating method based on numerical weather prediction data. The solar energy resource evaluating method comprises the steps that firstly, terrain data, sea temperature data, ground vegetation data and global reanalysis data of a region to be detected are obtained; secondly, the region to be detected is subjected to solar irradiation simulation in a WRF mode, and long-term data of solar irradiation is obtained; thirdly, solar resources of the region to be detected are evaluated according to the long-term data of solar irradiation. Compared with the prior art, according to the solar energy resource evaluating method based on the numerical weather prediction data, the solar resources are evaluated based on the numerical weather prediction data without dependence on observation data, places without observation data can be evaluated, and high operability and application and popularization value are achieved.