Wide and thick plate online straightening device and process

The invention discloses a wide and thick plate online straightening device and a process. The wide and thick plate online straightening device comprises a driving device, a plate shape gauge, carrier rollers, a straightening machine and a straightened steel plate; the straightened steel plate is supported by the carrier rollers and is driven by the driving device, the unevenness of the straightened steel plate in the length range of the plate shape gauge is measured by the plate shape gauge, and then the straightening machine straightens the straightened steel plate under the control of a central control system; and in the straightening process of the straightened steel plate, the central control system controls the introduction of pulse current according to the unevenness of the straightened steel plate. The method that the pulse current is introduced in the straightening process is adopted, on one hand, the plasticity of the plate is improved through a thermoelectric effect and an electroplastic effect, and