Steel conveying system

The invention provides a steel conveying system, which relates to the technical field of steel production, and comprises a feeding roller way for conveying a steel plate from a feeding port to a pretreatment unit; the pretreatment unit is used for pretreating the steel plate; the defect detection unit is used for carrying out defect detection on the pretreated steel plate and marking defects of the steel plate; the detecting and classifying unit is used for detecting the thickness of the steel plate which reaches the standard through defect detection; the leveling unit is used for leveling the medium-thickness steel plate and transporting the leveled medium-thickness steel plate to the scribing unit; a scribing unit for scribing the steel plate; and the cutting unit is used for cutting the marked steel plate along the marked line. The defect detection unit is arranged to detect the defects of the steel plate according to the standard, and the steel plate which does not meet the standard participates in the pr