Heating control method for relieving strip steel narrowing caused by watermark temperature difference of heating furnace

The invention relates to the technical field of heating furnaces, and discloses a heating control method for reducing strip steel narrowing caused by watermark temperature difference of a heating furnace, which comprises the following steps of: S1, judging the local low correlation between hot coil strip steel width fluctuation and finish rolling temperature by combining the trends of a finish rolling temperature full-length curve and a width full-length curve; s2, according to the distribution of different low points of the full-length curve of the finish rolling temperature, the generation reason of the full-length low points of the finish rolling temperature is judged by combining a heating furnace cloth diagram, and S3, through big data regression analysis in the production process, it is determined that the hot coil strip steel width local narrowing phenomenon is related to the temperature of the first heating section of the heating furnace. A perfect heating control method is formed, the heating furnace