Device and method for detecting sulfur content of railway roadbed filler

The invention relates to a device and a method for detecting the sulfur content of railway subgrade filler, relates to the technical field of detection of the sulfur content in a subgrade, and aims to solve the problems that the field detection of the sulfur content of the railway subgrade filler is difficult and inaccurate. The detection device provided by the invention comprises an Rh target X-ray tube, a diffraction crystal, a spinning sample table, a light path fixing device and a detector, x-rays emitted by the X-ray tube are diffracted by the diffraction crystal to generate diffraction rays serving as a primary target to irradiate the surface of a sample, and meanwhile, the diffraction crystal is excited to generate element characteristic X-ray fluorescence serving as a secondary target to irradiate the surface of the sample. A continuous scattered ray background is greatly reduced through monochromatized X-rays, the signal-to-noise ratio of element characteristic X-ray fluorescence is increased, elemen