The utility model discloses a test sample marker. The test sample marker comprises a dotting warhead, a transmission device, a pedestal and a dotting warhead shell and is characterized in that the dotting warhead is mounted in the dotting warhead shell, the transmission device is connected with the dotting warhead, the dotting warhead is driven to move up and down through the transmission device, a test sample is mounted on the pedestal, and the dotting warhead is in contact with the test sample when falling off. The test sample marker uses a steel tapper, the mark is still clear after the test sample is fractured or an oxide scale drops out, and there are three groups of 50.8 millimeters original scale distance. Compared with the prior art, the test sample marker is convenient to operate, is durable, is high in safety, enables the elongation detection precision to be improved, enables the sample dotting time to be shortened, enables the timeliness ratio to be improved, enables the inspection period to be shortened, and rarely influences the detection result.