Suspension system of off-highway dump truck

The invention discloses a suspension system of an off-highway dump truck. The suspension system comprises drive axles, a hydropneumatic suspension device and a guiding device, wherein the drive axlescomprise a middle drive axle and a rear drive axle; the hydropneumatic suspension device comprises suspension cylinders respectively arranged on the middle drive axle and the rear drive axle, and energy accumulators arranged on a truck body; the energy accumulators communicate with a single-side suspension cylinder through a pipeline; the guiding device comprises one A-type frame and one transverse stabilizer bar which are respectively fixed to the middle drive axle, and the other A-type frame and the other transverse stabilizer bar which are respectively fixed to the rear drive axle; the twoarms of the A-type frames are mounted on the drive axles; and one ends of the transverse stabilizer bars are connected with the drive axles, and the other ends of the transverse stabilizer bars are connected with the truck fra