The application discloses a straightening control method of a steel plate. The method comprises: if a straightening machine has a biting condition, a controller controls a straightening roller rotateforwardly at a first speed and the head of a to-be-straightened steel plate is bitten into an entrance roller slit of the straightening roller; whether the biting length of the head of the to-be-straightened steel plate reaches a preset straightening length is detected; if so, first straightening of the head of the steel plate is completed and the straightening roller is controlled to rotate reversely at a first speed, so that the straightening roller completes second straightening of the plate head along an opposite direction; and if the head of the to-be-straightened steel plate is separatedfrom the entrance roller slit, the straightening roller is controlled to rotate forwardly at a first speed. Therefore, the straightening time of the steel plate is shortened effectively, so that thestraightening efficiency of the steel plate is improved effectively.