As wheeled tractors are widely used as power machinery in agricultural activities, the lateral stability of a tractor directly affects the operation efficiency and machine safety with worldwide inevitable rolloverinduced injuries and fatalities. From the perspective of active safety control, this article aims to apply the reverse moment of an accelerating momentum flywheel to the rolling tractor. In this study, we analyzed the evolution mechanism of the tractor dynamic overturning behavior by mathematical modeling. In order to keep the original configuration of the main structure of the tractor, the momentum flywheel was installed in the tractor front to replace the conventional static ballast, while it actively provided the antirollover torque in emergency cases. Using Matlab/Simulink, the simulation work on the effectiveness of the PID speed control was carried out. Furthermore, a scalemodel experimental platform was designed to verify the flywheelbased tractor active stability control system. The results showed that the tractor equipped with a flywheel was able to regain lateral stability repeatedly in one experimental run. The test data under different driving conditions were compared with the uncontrolled group verifying the effectiveness and accuracy of the tractor dynamic model and the active control algorithm proposed in this paper. The proposed approach potentially provides theoretical basis and technical support for the extension of tractor active stability control technology. 