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Due to the large delay, large inertia, nonlinearity and strong time-varying characteristics of superheated steam temperature control in thermal power plants, traditional PID control algorithms are difficult to achieve good control effects. In order to optimize the superheated steam temperature control of thermal power plants, an improved cascade PID control algorithm based on DMC is proposed. The algorithm uses DMC to improve the input parameters of the main controller, predicts the future output value, and corrects the input parameters by the difference between the predicted value and the actual value. The simulation results show that compared with the traditional PID control algorithm, the algorithm reduces the overshoot of superheated steam temperature, shortens the transition time of steam temperature control, improves the anti-disturbance capability of the control system, and makes the dynamic performance of the control system. Static performance has been greatly improved.