Energy saving device for engine of vehicle

The utility model relates to an energy saving device for an engine of a vehicle, which mainly solves technical problems of high oil consumption, high carbon deposition possibility and the like in the traditional vehicle engine. According to the technical scheme provided by the utility model, the energy saving device is characterized in that the upper part of an outer shell is provided with an air inlet pipe and an air outlet pipe; an upper clapboard and a lower clapboard are fixedly arranged in the outer shell, the air inlet pipe respectively passes through a shell top plate, the upper clapboard and the lower clapboard and enters a lower cavity in an airtight fit manner, and the end part of the air inlet pipe is provided with an air inlet pipe elbow; the air outlet pipe passes through the shell top plate in an airtight fit manner to be communicated with an upper cavity; a first-stage separation pipe and a second-stage separation pipe are arranged in a middle cavity, the upper part of the first-stage separation pipe is provided with a first-stage separation pipe vent hole, the lower part of the first-stage separation pipe is communicated with the lower cavity, the lower part of the second-stage separation pipe is provided with a second-stage separation pipe air inlet, and the upper part of the second-stage separation pipe is communicated with the upper cavity. The energy saving device disclosed by the utility model enables fuel to be sufficiently burned to realize a fuel saving effect, can reduce fuel consumption by 10-20% generally, and can be widely applied to various vehicle engines.