The utility model discloses a hot flue gas preheating device of material off -line belongs to the metallurgical technology field, and the device is including preheating chamber, feeding device and receive the material device, preheating chamber and electric arc furnace keep apart, and personally submit minimum contained angle with the level and be 30 settings. Because the utility model discloses a preheating chamber keeps apart to set up with the electric arc furnace, need not to change furnace body, original production procedure and smelting mode, only needs to pass through the pipeline intercommunication with the electric arc furnace and can realize waste heat recovery, this simple structure, reform transform little, small investment, the cost recovery is fast, through the control to the flue gas, its margin of safety and mobility are high, and adaptability is strong.