Method for automatically controlling width of hot rolled steel coil

The invention discloses a hot rolled steel coil width automatic control method. Firstly, width data in the slab production process are collected, and the average value of the width data is calculated; the actual finish rolling steel pulling amount and the actual coiling steel pulling amount are obtained through calculation, and a steel pulling amount self-adaptive genetic table is established; after the plate blank is subjected to steel drawing, the steel drawing amount self-adaptive genetic table is inquired to obtain genetic data, if the genetic data fails to be obtained, a default width allowance value is returned and selected, and if the acquisition succeeds, a coiling width allowance prediction value is calculated for the strip steel to be rolled currently; calculating a width margin correction recommendation value; thirdly, setting the width allowance of the electrical equipment according to the default width allowance value or the width allowance correction recommended value, and performing slab rollin