The invention provides a gasoline engine spark plug, which comprises a center electrode part and a grounding electrode part arranged around the center electrode part, wherein the center electrode partis provided with a wiring screw, an insulator arranged around the wiring screw and a center electrode which is arranged at the tail end of the wiring screw in a mode of being integrated with the wiring screw and protrudes from the insulator, the grounding electrode part comprises a metal shell and a grounding electrode which extends out from the metal shell at the tail end of the metal shell, andthe grounding electrode and the center electrode are arranged opposite to each other at an interval so as to form an air gap. The gasoline engine spark plug is further provided with an electromagnetic induction heating coil, wherein the electromagnetic induction heating coil is close to the tail end of the grounding electrode part and the tail end of the center electrode part and located betweenthe center electrode part and the grounding electrode part. The invention further provides an ignition method of the spark plug, which comprises a step of heating the spark plug before the ignition. The gasoline engine spark plug enables an automobile to normally start at a low temperature, enables the engine temperature to quickly rise to the normal operating temperature, and is small in pollution and capable of removing carbon deposition and prolonging the service life of the engine.