Method for controlling temperature of finishing mill

Method for controlling temperature of finishing mill includes: obtaining an inlet measuring temperature and an outlet measuring temperature of one of roller sets of the finishing mill; training a machine learning model corresponding to the one of the roller sets according to multiple sets of historical thermal conductivity coefficients; using a difference between a measuring temperature drop and a theoretical temperature drop as input to establish an objective function; executing an optimization algorithm according to the objective function to try multiple sets of thermal conductivity coefficients, input each set of thermal conductivity coefficients to the machine learning model to obtain an inlet theoretical temperature and an outlet theoretical temperature, and search a set of thermal conductivity coefficients which optimizes the objective function. The measuring temperature drop is the inlet measuring temperature minus the outlet measuring temperature. The theoretical temperature drop is the inlet theoreti