The invention discloses a novel spark plug for an internal combustion engine, which includes a mounting base and a spark plug cooperating with the mounting base, the mounting base is provided with a left and right penetrating first cavity, A second cavity surrounding the first cavity is disposed in the first cavity end wall, A third cavity having a left-facing opening is arranged in the end wall of the right side of the second cavity, a fourth cavity communicating with the third cavity is arranged in the top wall of the first cavity, a fifth cavity is arranged on the right side of the fourth cavity, and a first rotating cavity penetrating the fifth cavity and communicating with an external space is arranged in the end wall of the right side of the fourth cavity. The device structure of theinvention is simple, The spark plug uses the same power source to drive the connection and protection of the ignition device, and realizes the locking of the spark plug in the operation process, thedevice is convenient to install, meanwhile, the protective device is arranged to prevent the spark plug from aging at high temperature in the combustion chamber, and each process cooperates with eachother without affecting each other, thus improving the practicability of the device.