The present invention relates to a fuel saving device for a vehicle. In brief, the present invention relates to installing a device necessary for electrolyzing water using a DC power supply, and using a temperature sensor in order to meet an optimum condition in which water is electrolyzed. By installing a circulation pump and membrane filter, continuously forming conditions under which the aqueous solution mixed with electrolyte and antifreeze is decomposed to maximum, and installing a rotor and an alternator which functions as a spoiler on the battery of the vehicle and the outside of the vehicle, It generates electricity by using air resistance to supply power in combination to electrolyze water and supply the generated oxygen and hydrogen to the air tube of the vehicle to supply the air necessary for combustion, thereby promoting combustion and the heat of combustion of hydrogen and oxygen It is a device that saves fuel in the internal combustion engine by energy;When combustion is carried out by adding a small amount of hydrogen to an internal combustion engine such as a gasoline engine or a diesel engine, the results of the increase in output and the emission of harmful exhaust gas have been proved by several studies. Therefore, environmental pollution is serious. In the real world that is becoming increasingly exhausted and the fossil energy of the earth is depleted, this design can be said to be indispensable in terms of energy saving and eco-friendliness.
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