Tensile testing machine with marking positioning and clamping device

The utility model provides a tensile testing machine with marking positioning and clamping devices, which comprises a tensile testing machine main body, a support sliding rod is arranged on the tensile testing machine main body, two support frames are sleeved on the support sliding rod in a sliding manner, and a clamping device is arranged on each support frame; the clamping device comprises a fixed clamping plate, a locking screw, a movable clamping plate, a compression spring, a baffle and a guide column. The right end face of the fixed clamping plate is attached and fixed to the left end face of the supporting frame, and the two locking screws are perpendicular to the left end face of the fixed clamping plate. The movable clamping plate is located between the two locking screws, two guide columns perpendicular to the movable clamping plate are arranged on the left end face of the movable clamping plate, compression springs are arranged on the guide columns, and the baffle is fixed through locking nuts afte