The utility model discloses a tensile experiment clamping device of equilateral angle steel, including setting up the grip block in two ends in the experiment angle steel respectively, the grip block with be provided with lining corner pad steel between the experiment angle steel, it is fixed that grip block, lining corner pad steel and experiment angle steel pass through the bolt centre gripping, makes the section center of grip block with the section center coincidence of experiment angle steel, grip block and fixed arm fixed connection. A tensile experiment clamping device of equilateral angle steel, including grip block, lining corner pad steel and fixed arm, the experiment angle steel will serve as a contrast the corner pad clip with the grip block and hold in the centre, the design time guarantees that the section center who tests angle steel and grip block works in unison especially, to the angle steel of different models, through the thickness of design change lining corner pad steel, can guarantee once more that the section center who tests angle steel and grip block works in unison to realize the load that carries on of in the experimentation nos unbalance loading, improve and test the precision.