The invention discloses an autoantibody spectrum analyzer, comprising a centrifugal device, wherein the centrifugal device comprises a centrifugal reaction plate, a test tube stand and a driving mechanism, the test tube stand has a test tube hole for inserting a test tube, the test tube stand is provided with a test tube clamping device for clamping the test tube inserted in the test tube hole, the test tube clamping device comprises test tube clamping jaws rotatably disposed on the test tube stand and an elastic member for applying an elastic acting force to the test tube clamping jaws, a plurality of test tube clamping jaws are provided, and all test tube clamping jaws are uniformly distributed along the circumferential direction. The autoantibody spectrum analyzer disclosed by the invention is provided with the test tube clamping device for clamping the test tube, the opening and closing between the test tube clamping jaws meet the placement requirements of test tubes of different diameters, so that the versatility can be improved, furthermore, the noise generated by the possible collision between the test tube and the test tube stand during the operation of the autoantibody spectrum analyzer can be reduced, so that the damage risk of the test tube is reduced.