The invention relates to a full-automatic loading and unloading device for a large vehicle longitudinal beam hydraulic machine, an outer input mechanism comprises a roller table frame, a plurality of driving rollers mounted on the roller table frame, lower supporting plates positioned between the adjacent driving rollers and side baffle plates mounted on the roller table frame, wherein the lower supporting plates are mounted on the roller table frame, a material blocking side bent plate which gradually approaches the central line of the roller table frame along the output direction of a blankis fixedly connected on one side of the output end of the roller table frame, and the plurality of the driving rollers include a magnetic driving roller. The full-automatic loading and unloading device can lead plate materials to automatically smoothly reach the set position for realizing accurate positioning, realize automatic loading and unloading of the plate materials with different specifications, lead the irregular plate materials to smoothly enter into a die, and further realize automatic operation by controlling all actions through an electrical program; and the full automation can lead the operation to be convenient, save a large amount of manpower and time and improve production efficiency. The full-automatic loading and unloading device can realize accurate positioning of the plate materials, fast loading and unloading speed and conveying of the plate materials with the different specifications.