Spark plug for motor vehicle

The utility model discloses a spark plug for a motor vehicle, which is composed of a center electrode, an insulator, a shell and a specially designed grounding side electrode, wherein the upper part of the insulator is arranged in the shell; the center electrode is arranged in the insulator and extends out of the top end of the insulator; the top end of the shell is provided with the grounding side electrode; and a main body part of the grounding side electrode is provided with a groove and of a flat shape, the part, which inclines inward and opposite to the center electrode, is divided into three branches with the top end of each branch being of the shape of a pointed cone, and the distances or gaps between each of the branches and the center electrode are different. The novel spark plug provided by the utility model can have more than two kinds of spark gaps and more than three kinds of ignition points under the condition of not increasing ignition pulse voltage, thereby enabling an engine to have enough ignition energy to ensure the spark plug to ignite normally no matter whether the engine stays at a high-speed operating state or a low-speed operating state, effectively improving the output power and the efficiency of the engine, and greatly reducing fuel consumption and reducing exhaust emission at the same time.