The utility model discloses a postose small -size rectangular cross -section metal specimen tensile test clamp, including the anchor clamps main part, the anchor clamps main part includes the same cylindrical section of diameter and semicircle shell of column, cylindrical section one end and semicircle shell of column coaxial coupling, the other end are provided with the inside sunken internal thread coaxial with the cylindrical section, the side along the diameter be provided with with the parallel cotter hole of semicircle shell of column diametral plane, semicircle shell of column one end links to each other with the cylindrical section, and the other end is provided with arc processes. Need carry out various operations with the manipulator about postose small -size sample testing at home at present. Adopt plain clamp, because mechanical arm operating's limitation, the operation is inconvenient, the utility model discloses postose small -size rectangular cross -section metal specimen tensile test special fixture adopts simple connected mode and tensile equipment to be connected, and it is more simple and convenient to change anchor clamps when it is used, can be through the light completion of manipulator, great reduction testing personnel's radiation dose.