The invention discloses a high-efficiency heavy scrap cutting device, which comprises a base. A roller way is mounted on the base, a cutter operating platform is mounted on the base on the lateral face of the roller way, a first pusher and a large-section cutter are mounted on the cutter operating platform, a first slice discharging device is mounted between the cutter operating platform and the roller way, a transverse support and a longitudinal support are mounted on one side of the tail end of the roller way, a transverse movable block is mounted on the transverse support, a transverse cutting torch is mounted on the transverse movable block, a longitudinal movable block is mounted on the longitudinal support, a longitudinal cutting torch is mounted on the longitudinal movable block, atrolley guide rail is arranged below the transverse support and the longitudinal support, and a transition trolley is mounted on the trolley guide rail. The high-efficiency heavy scrap cutting devicecan be used for automatically cutting large-sized steel scraps and replacing manual operation, long-term smoke contamination for operators can be avoided, and heavy scrap cutting efficiency can be improved substantially.