The invention belongs to deck jacking devices in the field of automobile transportation with ships, and relates to a deck jacking device for an automobile roll-on-roll-off ship. The deck jacking device comprises a control system and a jacking system. The deck jacking device is characterized in that the control system comprises a console and a remote control handle; the jacking system comprises a hydraulic assembly, an upper frame, a lower frame, a shear part, a front axle and a rear axle; the hydraulic assembly is used for driving the shear part to be opened and closed so that the upper frame can be driven to go up and down; and the hydraulic assembly is used for driving the front axle and the rear axle to move. The jacking device disclosed by the invention is compact in structure, small in occupied area, flexible to move and capable of adjusting the heights of movable decks conveniently. A lifting device needing to be arranged on each movable deck is omitted, and thus the shipbuilding cost is reduced.