Straightening method of tempered steel plate

The invention provides a straightening method of a tempered steel plate, and the method is characterized in that after a steel plate which is thermally treated is tempered, the steel plate is cooled to 140DEG C to 160DEG C on a thermal treatment cold bed, then the steel plate is conveyed by a roller bed to the front of a cold straightening machine, and the steel plate is enabled to enter the cold straightening machine to be straightened at the temperature of 80 to 100 DEG C; a small roll gap is set in the primary two passes, so that the steel plate is bent; and a large roll gap is set in a third pass, so that the steel plate is flattened. Due to the adoption of the method, the edge wave defects of the steel plate can be eliminated, the surface smoothness of the steel plate can be guaranteed, and the qualification rate of the steel plate shape can be improved by more than 30 percent.