Abstract: The number of repeated bending test was one of the important indexes reflecting the toughness of steel wire. There were many clamps in the repeated bending test machine, and the clamps were easy to damage the steel wire surface during the test. Therefore, the clamps for repeated bending test were improved. The results show that the improved new clamps solved the problem that the old clamps were easy to damage the steel wire surface during the repeated bending test, reduced the total number of the clamps, and promoted the use efficiency of the clamps.