Size standard identification system for flat steel bar

The invention relates to a size standard identification system for a flat steel bar. The system comprises a mobile sensing device which is used for moving to a position right above the top of the flat steel bar before the flat steel bar is put into use so as to face the top surface of the flat steel bar to execute photoelectric sensing operation; and the area analysis equipment is used for sending an area deviation signal when the intelligently analyzed top surface area of the flat steel bar is not in the top surface area distribution interval of the flat steel bar with the standard size. Through the system, the AI processing model can be adopted to intelligently analyze the surface area, corresponding to the imaging lens direction, of the flat steel bar, namely the top surface area of the flat steel bar, based on various picture parameters of the target sub-picture and the lens focal length corresponding to the sequential conversion image; and when the top surface area of the flat steel bar is not in the top