On-line annealing device for ultrahigh-strength steel

The utility model relates to the technical field of welding seam annealing, in particular to an ultrahigh-strength steel online annealing device which comprises online annealing equipment, a temperature sensor, a controller and display equipment. The online annealing equipment is arranged at the first end of the annealing production line, the input end of the temperature sensor is arranged at thesecond end of the annealing production line, and the target ultrahigh-strength steel is conveyed from the first end to the second end; the output end of the temperature sensor is connected with the input end of the controller; the first output end of the controller is connected with a power switch of the online annealing equipment, and the second output end of the controller is connected with theinput end of the display equipment. After the temperature of the annealed welding seam is detected, the temperature of the welding seam is displayed through the displayer, data support is provided foroptimizing the post-weldin