This paper built a spectral response model of the “Jilin-1” night light remote sensing camera to analyze the reasons of the out-band spectral response and proposed a method for the out-band spectral response correction of the night light remote sensing satellite. According to the relationship between the spectral response of the remote sensing camera in each band, the out-band response correction coefficient is obtained by calculating the standard light sources with different spectral characteristics. The out-band spectral response of the target light source in the night light remote sensing images is corrected, and the radiance of the target light source is inversed through on-orbit experiments. The corrected radiance difference of the night light remote sensing satellite is significantly reduced, with an average decreasing from 10.53% to 4.88%, and the radiance difference in each band is less than 7%.