X fluorescence spectrometer

The invention belongs to the technical field of optical measurement, and particularly discloses an X-ray fluorescence spectrophotometer which comprises a box body, a vacuum unit, a ray tube unit, a detector unit and a test board, the ray tube unit comprises a ray tube and a collimator, and the detector unit comprises a detector and a probe; the box body is provided with a slot, and the test board can be installed in the slot in a clearance fit manner. A ray slot and a detection slot are communicated with the slot, a ray tube mounting cavity is communicated with the ray slot, and a detector mounting cavity is communicated with the detection slot; a transparent sample box is arranged on the test plate; and a sealing structure is arranged at the outlet of the slot, is opened when the test board is inserted, and is closed when the test board is taken out. By means of the gas internal circulation system, good working temperature and humidity can be provided for components of the spectrograph, heat around the compo