The invention discloses an automobile ignition device with a lock plunger-lock cylinder structure based on elastic rope tensile force, and belongs to the technical field of automobiles, electronics, precision machinery, industrial production, manufacture and the like. The automobile ignition device comprises a photoelectric mechanism, a motion mechanism and a lifting and damping mechanism. A laser, a lens, an annular light transmitting piece and a photoelectric converter are arranged on the photoelectric mechanism along the light ray transmission direction coaxially and sequentially. The motion mechanism comprises a lock cylinder, a transmission mechanism, a bearing end and a fixing end. Based on the elastic rope tensile force, the lock cylinder structure jumps from the Start end to the Onend automatically. The lifting and damping mechanism is arranged below the bearing end, and sequentially comprises a lifting air cylinder and a damping adjuster from the top to bottom. The automobileignition device has the advantages that a driver is forced to pause at the Acc gear and the On gear temporality when starting a car, so that burdens of an accumulator are reduced, service life of theaccumulator is prolonged, an engine is protected, carbon deposition is reduced, and the car is protected.