The invention provides a temperature control method for a heat-preservation casting blank to be rolled. The method has the following steps: (1) establishing rolling program information; (2) obtaining temperature correction value Tn of the heat-preservation casting blank to be rolled corresponding to the heat preservation time of the casting blank to be rolled; (3) establishing a heating mathematical model for computing the current temperature theta AV of the heat-preservation casting blank to be rolled; (4) correcting the current temperature theta AV of the heat-preservation casting blank to be rolled so as to computing the correction temperature T of the heat-preservation casting blank to be rolled; and (5) correcting and controlling the temperature of the heat-preservation casting blank to be rolled by means of the correction temperature. The temperature control method is capable of lowering heat loss, effectively avoiding rolling fluctuation caused by temperature fluctuation, guaranteeing temperature control accuracy and temperature stability of the heat-preservation casting blank to be rolled during rolling, and obviously saving heat energy.