Plastic tensile property testing device

The utility model discloses a plastic tensile property testing device, which is characterized by comprising a rack, a workbench arranged on the rack, a positioning mechanism and a stretching mechanism, the positioning mechanism and the stretching mechanism are arranged on the workbench, the positioning mechanism comprises two groups of vertical plates which are parallel to each other, a through hole is respectively arranged above the two groups of vertical plates, and the two groups of vertical plates are respectively provided with a through hole. The top of each group of vertical plates is in threaded connection with a butterfly bolt, and the bottom of each butterfly bolt is inserted into the corresponding through hole; the stretching mechanism comprises a vertical rod and a pull rod, a mounting hole is formed in the workbench, the middle of the vertical rod is movably inserted into the mounting hole, the vertical rod is arranged between the two sets of vertical plates, the bottom of the pull rod is rotation