Fixing device for sample preparation clamp

The utility model discloses a fixing device for a sample preparation clamp. A fixing pin is arranged on a base, the fixing pin penetrates through a threaded hole so as to fix the clamp on the base, and while the fixing pin penetrates through the threaded hole, the positions of an upper clamping piece and a lower clamping piece of the clamp are limited, so that the upper clamping piece and the lower clamping piece are aligned with each other while fixing a chip, and the following problems in the prior art: in the process of preparing a sample in a tensile fracture experiment, the upper clamping piece and the lower clamping piece of the clamp are not aligned with each other while fixing the chip due to the influence of a human factor or a factor at a baking stage, so that the chip is damaged because of uneven pressure, and therefore, the successful rate of sample preparation is lowered, are avoided. The fixing device disclosed by the utility model increases the successful rate of the sample preparation, and lays the foundation for the normal proceeding of the subsequent tensile fracture experiment.