Fixing device for detecting percentage elongation after fracture of reinforcing steel bar

The utility model provides a fixing device for detecting the percentage elongation after fracture of a steel bar, and belongs to the technical field of steel bar detection. The fixing device for detecting the percentage elongation after fracture of the reinforcing steel bars comprises the placing assembly and the fixing assembly, firstly, due to the fact that a plurality of V-shaped grooves are formed in one side of the bottom plate, a plurality of spliced reinforcing steel bars needing to be measured can be placed in the V-shaped grooves at the same time, a vernier caliper can conveniently measure the plurality of spliced reinforcing steel bars at the same time, and the detection efficiency is improved; secondly, the two supports move relatively through the driving seat, the multiple pressing pieces are arranged on one sides of the supports, the reinforcing steel bars spliced in the V-shaped grooves can be pressed and fixed through the pressing pieces, the stability during measurement is improved, different