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The invention relates to the field of boiler systems, and discloses a temperature adjusting system for a last-stage reheater of a boiler, which is used for improving the operation safety and reliability of the last-stage reheater of the boiler. Comprising the steps of collecting real-time temperature data of key parts of a boiler by connecting a power plant SIS or DCS system, and additionally installing a thermocouple enhancement data set to generate a temperature data set containing spatial position information. And calculating to obtain the three-dimensional temperature field distribution of the pipeline by using a model considering the dynamic change of the oxide skin. And based on the distribution, monitoring overtemperature points in real time, and generating temperature state evaluation and overtemperature early warning information. According to the invention, an equipment life prediction model is established, the damage accumulation degree of the pipeline material is evaluated, the residual life is predicted, a preventive maintenance strategy is made, and a maintenance plan suggestion is generated and integrated to a power plant maintenance plan system to guide equipment maintenance management.