Automatic steel detection device

The utility model discloses an automatic steel detection device which comprises steel defect detection devices arranged above and below a steel conveying roller way, and laser marking devices arranged above and below the steel conveying roller way, the steel defect detection device comprises a double-layer fixing frame, industrial line-scan digital cameras are installed on the upper layer and the lower layer respectively, and a surface defect recognition unit is installed on the double-layer fixing frame and used for recognizing steel surface defects in images shot by the industrial line-scan digital cameras. The laser marking device comprises two cross beams which are arranged in parallel; at least one laser marking machine is mounted on the cross beam; and the laser marking machine is used for printing marks on the steel surface with steel surface defects on the surface of the steel. According to the utility model, the industrial line-scan digital camera is adopted to shoot steel, and then the laser marking