A metal plate loading/unloading and cutting method and system comprises: a block cart and a sheet cart both of which are arranged on a guide rail; a cutting operation unit arranged at one side of the guide rail and comprising a first and a second fast moving table arranged in parallel and a laser cutting head, the two fast moving tables being arranged perpendicular to the guide rail and each provided with a cutting station and a waiting station, the laser cutting head moving over the two cutting stations along its guide rail, and the waiting stations corresponding to the side of the guide rail of the block cart and the sheet cart; a carrying and stacking robot arranged between the cutting operation unit and the guide rail of the block cart and the sheet cart, a robot external shaft being parallel to the cart guide rail and extending over the two fast moving table waiting stations of the cutting operation unit; and a waste material conveying device arranged below the two cutting stations of the cutting operati
