NOVELTY - Vehicle energy auxiliary device comprises a hydrogen/oxygen generating unit, where the generating unit mainly comprises an electrolyzer for generating hydrogen and oxygen. The inner part of the electrolyzer is provided with multiple electrode plates at an interval. A first water inlet, a hydrogen/oxygen outlet and two terminals connected with the electrode plates are arranged on the electrolyzer. The bottom of the electrolyzer is provided with a cooling component and the outer wall is provided with a temperature sensor component. A pipeline unit comprises a first conduit and a second conduit.    USE - Used as a vehicle energy auxiliary device.    ADVANTAGE - The device adjusts the current output of the vehicle battery according to the vehicle accelerator pedal circuit module in starting condition of the vehicle engine, processes electrolyzation regulating of the hydrogen/oxygen generating unit so that the timely generated hydrogen/oxygen source can be automatically accessed in engine room after entering in induction manifold and thus the device saves the vehicle fuel consumption and reduces the environmental pollution.    DETAILED DESCRIPTION - Vehicle energy auxiliary device comprises a hydrogen/oxygen generating unit, where the generating unit mainly comprises an electrolyzer for generating hydrogen and oxygen. The inner part of the electrolyzer is provided with multiple electrode plates at an interval. A first water inlet, a hydrogen/oxygen outlet and two terminals connected with the electrode plates are arranged on the electrolyzer. The bottom of the electrolyzer is provided with a cooling component and the outer wall is provided with a temperature sensor component. A filtering unit is provided with a water storage tank for filtering steam and a filtering screen is arranged in the water storage tank. A hydrogen/oxygen inlet and an outlet are arranged on the tank, and a water drain outlet is arranged under the tank, which is provided with a control valve. A pipeline unit comprises a first conduit and a second conduit. The first conduit is connected with the hydrogen/oxygen outlet of the hydrogen/oxygen generating unit and the hydrogen/oxygen inlet of the filtering unit. The second conduit is connected with the hydrogen/oxygen outlet of the filtering unit and the induction manifold of the engine. The device comprises a display for displaying the voltage and current of the vehicle battery and a computer control unit for controlling the actuation of the hydrogen/oxygen generating unit and the generated power of the hydrogen/oxygen gas. The computer control unit is electrically connected with the battery and the hydrogen/oxygen generating unit for controlling the power source of the hydrogen/oxygen generating unit to form an open circuit or close circuit and controlling the battery output current. The computer control unit is further electrically connected with the cooling component and the temperature sensor component. The cooling component is used for cooling the electrolyzer and the temperature sensor component is used for controlling the actuation of the cooling component and thus to prevent the excessive steam formed by the electrolysis high temperature. An electrically connecting vehicle accelerator circuit module is used to control the output current of the battery and thus to adjust the hydrogen/oxygen generating amount of the hydrogen/oxygen generating unit. The computer control unit is electrically connected to the display for detecting the voltage of the battery and the consumption of the current.