Steel bar diameter detection device

The utility model discloses a reinforcing steel bar diameter detection device, which relates to the technical field of reinforcing steel bar detection, and comprises a storage assembly and a first quantitative assembly, a detection ruler is placed in the storage assembly, the horizontal end of the detection ruler is connected with the first quantitative assembly, and the vertical end of the detection ruler is connected with a second quantitative assembly. According to the steel bar diameter detection device, the right-angle measuring scale is matched with the first quantitative assembly and the second quantitative assembly for combined use, so that a user can measure a steel bar with a circular or square cross section at different angles according to different handheld use space ranges, and the use flexibility of the whole device is improved; a fluorescent strip and a sliding strip are arranged, so that the smoothness of the first quantitative assembly and the second quantitative assembly on the surface of th