Clamp of stretching tester

The utility model discloses a clamp of a stretching tester belonging to the filed of measuring tools, which comprises two fixture bodies, wherein step holes are arranged on the fixture bodies. The step holes are arranged on the fixture bodies, a contact surface matched with the step surfaces of the step holes is arranged on a tested piece, and the step surfaces and the contact surface of the tested piece contact to stress. In the prior art, friction force between the tested piece and the clamp is used for carrying out pulling force test, and while the clamp of a stretching tester uses an axial pressure between the step surfaces and the contact surface to carry out the pulling force test, which avoids a skidding phenomenon generated when in test. The test data has high accuracy, the clamp of a stretching tester is suitable to test material with high strength and hardness, and the use life of a stretching machine and a fixture.