Hydraulic suspension system with mode switching function, switching method and vehicle

The invention discloses a hydraulic suspension system with a mode switching function, comprising: an actuator comprising a liquid inlet and a liquid outlet; the hydraulic energy supply device can output pressure liquid; the electro-hydraulic servo valve comprises a cut-off station and a communication station, and the actuator is communicated with the hydraulic energy supply device through the electro-hydraulic servo valve; the liquid inlet and the liquid outlet are respectively communicated with the electro-hydraulic servo valve through two independent communicating pipelines; and an electric control throttle valve and an energy accumulator are arranged on the communicating pipeline. By switching the electro-hydraulic servo valve, the electric control throttle valve and the energy accumulator, the suspension can be switched among an active suspension, a semi-active suspension and a passive suspension, and the structure principle is simple and easy to implement. Meanwhile, the invention further discloses a sus