In order to solve the problem of dynamic roll stability of multi-axis all-road crane, an independent suspension system with parallel adjustment of multi-accumulators is proposed. According to the mechanical model of steering dynamic force and roll moment of crane, the simulation model of multi-degree-of-freedom hydraulic suspension is established, and the effects of different speed, turning radius and road excitation on vehicle dynamic roll stability are studied. including output force characteristics and load transfer rate. The results show that under the steering condition of low speed 10 km/h and turning radius of 10.6, the load transfer rate is up to 0.023, while under the steering condition of high speed 80 km/h and turning radius of 39.27, the maximum load transfer rate is 0.292, and the vehicle driving is still stable. Even if driving on the dangerous road, the change range of load transfer rate is small, and the vehicle runs smoothly. The suspension system can adapt to multi-speed and different turning radius conditions, and has good robustness. This study can provide some reference for the suspension design of engineering vehicles.