The filter stack spectrometer attenuates the bremsstrahlung radiation by stacking filters and recording media of different materials in a string, records its intensity, and then uses the response function of the spectrometer to invert the bremsstrahlung energy spectrum. The spectrometer is mainly composed of collimation components, filter chambers, lead shields, sights and structural supports. Through 11 different types of metal filters, it achieves energy range coverage of 0.1MeV-10MeV.