An integrated combustion device power saving system comprising a hydrogen generation device, for generating a hydrogen-rich gas; a combustion device, coupled to the hydrogen generation device for receiving the hydrogen-rich gas to be used for combustion and generating heat energy and flue gas; a smoke distributing device, coupled to the hydrogen generation device and the combustion device for distributing flue gas to the hydrogen generation device or atmosphere; and a hydrogen-generation fuel preheating device, coupled to the smoke distributing device for capturing waste heat of the flue gas from the smoke distributing device to preheat a hydrogen-generation fuel to be used in the hydrogen generation device, characterised by further comprising a power generating device, coupled to the hydrogen-generation fuel preheating device for receiving the flue gas from the hydrogen-generation fuel preheating device while recycling waste heat of the flue gas to generate power to at least one of the devices selected from the group consisting of: the hydrogen generation device and the combustion device; a waste heat recycling device, coupled to the power generating device for recycling heat of the flue gas after the flue gas passes through the power generating device; and a flue gas temperature control heat exchanger, disposed at a position between the hydrogen-generation fuel preheating device and the power generating device so as to be used for receiving the flue gas from the hydrogen-generation fuel preheating device and a coolant from the power generating device for using the coolant to lower the temperature of the flue gas. a hydrogen generation device, for generating a hydrogen-rich gas; a combustion device, coupled to the hydrogen generation device for receiving the hydrogen-rich gas to be used for combustion and generating heat energy and flue gas; a smoke distributing device, coupled to the hydrogen generation device and the combustion device for distributing flue gas to the hydrogen generation device or atmosphere; and a hydrogen-generation fuel preheating device, coupled to the smoke distributing device for capturing waste heat of the flue gas from the smoke distributing device to preheat a hydrogen-generation fuel to be used in the hydrogen generation device, characterised by further comprising a power generating device, coupled to the hydrogen-generation fuel preheating device for receiving the flue gas from the hydrogen-generation fuel preheating device while recycling waste heat of the flue gas to generate power to at least one of the devices selected from the group consisting of: the hydrogen generation device and the combustion device; a waste heat recycling device, coupled to the power generating device for recycling heat of the flue gas after the flue gas passes through the power generating device; and a flue gas temperature control heat exchanger, disposed at a position between the hydrogen-generation fuel preheating device and the power generating device so as to be used for receiving the flue gas from the hydrogen-generation fuel preheating device and a coolant from the power generating device for using the coolant to lower the temperature of the flue gas.