The invention relates to a horizontal sponge cutting machine capable of rotationally slicing and discharging materials in a separating mode. The sponge horizontal cutting machine comprises a rack, a working table, a cutter box, a blade, driving shafts, pull rods, rotating arms and rotating mechanisms. The rack is installed at the two sides of the working table, the cutter box is installed at the lower end of the rack, the blade is installed in the cutter box, the two ends of the cutter box are fixedly installed at the lower end of the rack through the rotating mechanisms, the corresponding rotating arms are connected with the upper ends of the rotating mechanisms, the driving shafts are installed at the upper end of the rack, one sides of the driving shafts are connected with driving motors, the corresponding rotating arms are installed at the upper ends of the driving shafts, and the rotating arms at the upper ends of the driving shafts are connected with the rotating arms at the upper ends of the rotating mechanisms through the pull rods. The horizontal sponge cutting machine has the advantages that under the action of the driving shafts, the rotating mechanisms can drive the cutter box to rotate, the cutter can rotate by positive 360 degrees and minus 360 degrees to achieve vertical cutting, and the machining efficiency of sponge cutting is improved; a scraper knife can be directly inserted from the cut position to separate the materials, a conveying mechanism is capable of conveying the cut materials out, the materials can be separated and conveyed without waiting for being cut completely, and the producing and machining efficiency is greatly improved.