Device and method for online detection of shape of steel billet and precise cutting

The invention discloses a device and method for detecting the shape of a steel billet on line and precisely cutting the steel billet, and belongs to the technical field of steel billet production processes. The device comprises a steel billet cutting machine, a computer control system, two laser range finders and steel billet weighing equipment, the two laser range finders are arranged on the two sides of a to-be-cut steel billet correspondingly, and the two laser range finders are both installed in cooling protection equipment and used for detecting the shape of the to-be-cut steel billet online in real time; the steel billet weighing equipment is used for weighing the cut steel billets; and the steel billet cutting machine, the laser range finder and the steel billet weighing equipment are all connected with the computer control system. By the adoption of the technical scheme, whether the steel billet deforms or not can be judged online in real time, then the steel billet with the problem is cut off in time