In order to improve the reaction speed of the valve opening and closing and reduce the actual output error of valve lift, a hydraulic variable valve driving system was adopted, and the tracking effect was simulated and verified. A sketch model of engine valve system was established. According to Newton’s second law, the dynamic equation of the piston was deduced. The camless valve mechanism was improved, and a new hydraulic variable valve driving system was designed. The flow connection between the hydraulic cylinder and the high and low pressure hydraulic source was opened and closed by the rotary valve, so the inlet and outlet of the hydraulic cylinder were controlled. Two feedback PID controllers are designed to precisely control valve opening and closing timing and valve lift. The valve opening and closing angle and valve lift were simulated by using MATLAB software, and compared with those before improvement. The results show that before the improvement, when the valve opening and closing angles suddenly change, the fluctuation range is larger, the response speed of the control system is slower, and the tracking error of valve lift is larger; after the improvement, when the valve opening and closing angles suddenly change, the fluctuation range is smaller, the response speed of the control system is faster, and the tracking error of valve lift is smaller. Adopting hydraulic variable valve driving system, the flexibility of valve timing and lift is improved, the output precision of control system is higher, and the effect is better, the output precision of the control system is higher and the effect is better.