The utility model relates to a comprehensive energy saving device utilizing the surplus heat of a tunnel type kiln furnace, which belongs to the technical field of surplus heat utilization of the tunnel type kiln furnace. The comprehensive energy saving device is characterized in that a preheating temperature-rise zone of a tunnel kiln is provided with a dual-preheating device, the preheating temperature-rise zone of the tunnel kiln is separated into a front half part and a rear half part, and the front half part and the rear half part are respectively provided with waste hot smoke gas exhaust ports to carry out dual-preheating on a gas and a combustion-supporting air; a cooling zone of the tunnel kiln is provided with a compound heat-exchange cooling device, cold air enters a heat-exchange chamber to be exchanged into hot air and then enters a hot air pipeline, one end of the hot air pipeline is connected with a combustion-supporting air blower, and one end is connected with a combustion-supporting air pipeline inside a combustion system. According to the utility model, because the waste hot smoke gas of the tunnel type kiln furnace and the surplus heat of the cooling zone are sufficiently utilized to carry out the dual-preheating on the gas and the combustion-supporting air, and therefore, the surplus heat of the tunnel type kiln furnace is furthest utilized, the gas can be heated to the temperature more than 100 DEG C and the combustion-supporting air can be heated to the temperature more than 200 DEG C; and the tunnel type kiln furnace has very outstanding energy-saving effect.