An X-ray fluorescence spectrum analyzer, comprising a box body (100), a vacuum chamber seat (1), a ray tube unit (2) and a detector unit (3); the vacuum chamber seat (1)is disposed inside the box body(100) and is provided with a vacuum chamber (113); the ray tube unit (2) is disposed on the vacuum chamber seat (1); the detector unit (3) is disposed on the vacuum chamber seat (1); the vacuum chamber seat (1) is provided with a placing hole (121) in communication with the vacuum chamber (113), and a vessel device (4)is placed in the placing hole (121), and a sample chamber (411) is internally disposed in the vessel device (4), and the bottom of the vessel device (4) is provided with a through hole in communication with the sample chamber (411), and a light transmitting film sealing the through hole is provided on the vessel device (4), so as to make the sample chamber (411) to become a closed chamber, and a seal structure (5) is disposed between the vessel device (4) and the vacuum chamber seat (1). The analyzer solves the technical problem of the sample is difficult to be analyzed accurately caused by the sample cannot be placed inside the vacuum chamber (113).
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