The invention relates to an overload vehicle oil-gas spring test device and belongs to the test science technical field. A closed-loop control servo hydraulic system provides an effectively test device for an overload vehicle oil-gas spring. The device comprises an oil source of the high-pressure servo hydraulic system, an oil pipeline, an oil separation station, an energy accumulator, a servo valve block, a vibration exciter, a sensor, a four-stand-column frame, a tested piece clamp and a digital control cabinet and the like. A high-pressure oil pump can provide high-speed loading for the vibration exciter; and a digital control system arranged in the control cabinet collects data from the sensor and can provide accurate force control and displacement control for the high-speed overload vehicle oil-gas spring through closed-loop control so as to finish various tests and experiments.