Method for rapidly finding out roll marks of straightening machine by means of surface detection system

The invention discloses a method for rapidly finding out roll marks of a straightening machine by means of a surface detection system. The method for rapidly finding out the roller marks of the straightening machine by means of the surface detection system comprises the steps that the head of a steel plate is detected by means of a rising edge signal of a rear photoelectric detection device of thestraightening machine, and the tail of the steel plate is judged according to a falling edge signal of a front cold detection device of the straightening machine; after the tail of the steel plate isstraightened by the straightening machine, a roll gap of the straightening machine is opened, and the steel plate is subjected to transmission in the detection direction; and when the head of the steel plate reaches a cold detection position, the surface detection system starts to work; and when the tail of the steel plate leaves a hot detection position, the surface detection system stops photographing, and whether press