The dump truck is mainly composed of a chassis, a hydraulic dumping mechanism, a carriage, a sub-frame and accessories. Among them: hydraulic dumping mechanism includes gear pump, lifting valve, pipeline, lifting mechanism, limit mechanism, etc. The carriage includes front plate, side plate, bottom plate, tailgate and tailgate switching mechanism (van type), auxiliary car The frame is welded by the longitudinal beam, the cross beam, the lifting shaft and the connecting device with the main frame. The accessories include safety struts, limit devices and balance brackets.