The invention discloses a size maximization rapid 
cutting method for a steel plate in an abnormal rolling state. The method comprises the following steps that S1, the shape and direction of a camber of the abnormally rolled steel plate is judged, and whether an abnormal incoming steel plate can meet the 
cutting contract size or not is judged; S2, whether the camber of the abnormally rolled steel plate is a same-direction camber or a head-
tail camber: when the camber of the steel plate is the same-direction camber, segmented 
flame cutting is adopted, and when the camber of the steel plate is the head-
tail camber, 
flame cutting is carried out along the bending direction, before 
flame cutting, through angle adjustment and calculation, the 
effective size of the 
cut steel plate in the length direction and the width direction is increased, and size maximization rapid calculation of the steel plate before cutting is carried out; and S3, after size maximization rapid calculation of the steel plate, specific cutting operation of the optimized cutting technology is carried out on a cutting site. According to the method, the shape and direction of the camber of the rolled abnormal steel plate are judged firstly, the 
flame cutting line snapping mode is changed, the 
effective size in the length direction and the width direction is obviously increased by adjusting the angle along the bent side of the abnormal steel plate, and then 
maximum size cutting is achieved in the aspects of finished product yield, steel plate size rescue rate and contract rescue rate, and by utilizing the technology, the improvement can be achieved to a great extent.