The invention relates to the field of suspension devices of vehicles, and particularly relates to a gas-liquid-spring composite suspension device. Each hydraulic cylinder is filled with hydraulic oiland is connected with a hydraulic main pipeline by a hydraulic hose, a solenoid valve is arranged in the middle of the hydraulic hose to control on/off, the hydraulic main pipeline is communicated with a hydraulic oil cabin, a certain space is reserved above the hydraulic oil cabin to be connected with a high pressure gas cylinder, and a vent hole communicating to the atmosphere is controlled by the solenoid valve. One end of a spring is arranged on a fixed seat hinged below a piston of the hydraulic cylinder, and the other end of the spring is fixedly connected by a sleeve. The up-down movement of a piston rod is actively controlled by discharging gas to the atmosphere by the solenoid valve above the hydraulic oil cabin and supplying gas to the hydraulic oil cabin by the high pressure gascylinder, so as to control the up-down movement of the center of mass of the vehicle body. According to the invention, a gas-liquid-spring composite mode is adopted, and the orientated movement of the piston rod is realized by controlling the orientated discharge of gas, so as to solve the problem of adaptability of existing moving platforms in complicated road condition and the problem of lateral force possibly born by high speed driving.