The invention discloses a full-automatic wide-range rubble spreader for a steel bridge floor. The full-automatic wide-range rubble spreader comprises a frame, wherein traveling nail wheels are arranged on the bottom surface of the frame; a traveling track is arranged on the frame; an electric cable support rack is arranged on one side of the frame; a cable is hung on the cable support rack through pulleys; a power generator is arranged at one end of the frame, and a control box is arranged at the other end of the frame; a spreading hopper is placed on the traveling track through a wheel; a traveling motor is arranged on the spreading hopper, connected with the shaft of the wheel through a transmission mechanism, and connected with the control box through the cable; a deceleration sensor and a stopping sensor are arranged on the traveling track; a spreading roll is arranged at the outlet of the spreading hopper; a spreading roll motor is arranged on the spreading hopper, connected with the spreading roll through a transmission mechanism, and connected with the control box through the cable. The full-automatic wide-range rubble spreader has the advantages that the quantity of workers is reduced, the construction efficiency is improved, the construction period is shortened, and the construction quality is improved.