An energy-saving control system of a tire road roller comprises a controller, a display unit, a driving speed sensor, an engine rotation speed sensor, and a working / driving switch. The driving speed sensor used to detect a speed signal of the tire road roller, and the engine rotation speed sensor used to detect a engine rotation speed signal are connected with the input end of the controller, while the output end of the controller is connected with a solenoid valve of a hydraulic pump, a solenoid valve of a hydraulic motor, and the display unit. The working / driving switch is connected with the input end of the controller. The controller adjusts the hydraulic pump displacement based on the actual working load and under the premise that that the hydraulic pump displacement is as large as possible, so when the actual speed of the tire road roller is equal to the set speed, the controller adjusts the engine rotation speed automatically. Thus, the hydraulic system and the mechanical transmission system work in a high-efficiency area, to reduce the fuel consumption. The control system is provided with the simple structure and the high automation degree, and capable of adjusting the engine speed automatically in the real time way, promotes the working efficiency of the whole tire roller, and is energy-saving and environment-protecting.