This article addresses the issues of comfort and safety caused by excessive changes in vehicle posture while driving on rugged terrain. Based on active suspension control and combined with the collection of road surface elevation information in front of the vehicle and predictive control, it ensures that the vehicle's pitch and roll are minimized during driving, enhancing smoothness and handling. First, a mathematical model of a typical three-axle engineering vehicle is established, and a linear optimal controller is designed. A laser altimeter is installed in front of the vehicle to collect real-time height information of the road surface under the left and right wheels, and an optical speedometer is used to measure the longitudinal and lateral speeds of the vehicle. Finally, driving tests are conducted on trapezoidal obstacles, and experimental data show that compared to passive oil–gas suspension, the active hydraulic suspension combined with predictive control ensures smaller changes in vehicle posture, significantly improving driving comfort.