A microwave plasma vehicle engine igniter belongs to the technique field of the microwave application, and relates to a vehicle engine igniting device. The invention provides seven microwave plasma vehicle engine igniters with different structures, and realizes extremely high electric field intensity at the tail end of an actuator by using an electromagnetism principle that the voltage amplitude at the tail end of a quarter coaxial resonant cavity is maximum. A tip structure at the tail end of an inner conductor can further enhance the electric field intensity, thereby breaking down the surrounding oil gas mixture, generating the plasma and realizing the ignition. Subsequently through the rapid motion of the electron of the plasma in a combustion room, thus the body combustion of the whole combustion room and abundant combustion of the oil and gas mixture are quickly realized. The external outline of the engine igniter provided by the invention is identical to that of a prior spark plug, and the engine igniter can directly replace the prior spark plug system on a basis without changing the engine cylinder structure. The frequency of a working center is 2.45GHz. The igniter is in integrated design, and has the characteristics of high ignition efficiency, low manufacturing cost, easy mass production and the like.