Sample introduction test tube rack of atomic fluorescence spectrophotometer

The utility model provides a sample introduction test tube rack of an atomic fluorescence spectrophotometer, which relates to the technical field of test tube racks and comprises an integral structure and supporting structures, and the supporting structures are positioned at the front and rear positions of the two sides of the bottom of the integral structure; the overall structure comprises a base, a plurality of first placing holes which are evenly distributed are formed in the top of the base, and cylinders are fixedly connected to the positions, close to the edges of the two sides, of the front portion and the rear portion of the top of the base. The bottom of a test tube can be fixed and limited, a movable plate, a second placement hole, a second compression spring and a second fixing clamp are matched with one another, the top of the test tube can be fixed and limited, and then the situation that the test tube is inclined subsequently can be avoided; the first fixing clamp and the second fixing clamp ca