Rack convexity distribution and control method of PC + WRS hot continuous rolling finishing mill group

The invention discloses a rack convexity distribution and control method of a PC + WRS hot continuous rolling finishing mill group, which comprises the following steps: firstly, acquiring a data set of to-be-produced strip steel from a process control computer, including data such as finish rolling outlet strip steel width, target convexity and the like, and then calculating the upper and lower limits of proportional convexity in an equipment capacity allowable range by racks; the method comprises the following steps of: calculating the upper limit and the lower limit of the allowable proportion convexity under the stable production condition of the strip steel, and finally determining the proportion convexity distribution value of each rack according to the optimal capacity and the production stability to determine the PC angle and the roll bending force used by each rack, so that the capacity of the PC angle of the front rack can be fully exerted, the production stability between the racks is ensured, and t