The invention discloses an off-line type scrap steel preheating furnace, and belongs to the technical field of steelmaking. The off-line type scrap steel preheating furnace comprises a fixedly mounted tubular furnace body, a furnace bottom which can movably close or open the bottom of the furnace body, and a furnace cover which can movably close or open the top of the furnace body, wherein an exhaust smoke inlet is formed in the area at the upper part of the furnace cover or the furnace body; a slantways upward exhaust smoke outlet is formed in the area at the lower part of the furnace body. According to the off-line type scrap steel preheating furnace, the exhaust smoke inlet is formed in the area at the upper part of the furnace cover or the furnace body, and the exhaust smoke outlet is formed in the area at the lower part of the furnace body, so that high-temperature exhaust smoke can be introduced from the top of the furnace and discharged from the area at the bottom of the furnace body; therefore, a scrap steel material can be locally smelted near to the exhaust smoke inlet without being adhered to the furnace body, and no block is formed to the scrap steel material; the phenomenon that the scrap steel material cannot fall off is avoided, the reliability of equipment is improved, and the maintenance cost is reduced.