The automobile fly ball comprises a fly ball pin, a shaft rod, an oil discharging pipe, an oil suction pipe, an annular oil cylinder, a piston rod, a push rod, an oil suction groove, a reset spring, afly ball seat, a sliding sleeve, a sleeve, an annular rotating plate, a fly ball rotating plate, a push block, a sliding rod, an annular spray head, a one-way valve, an oil inlet pipe, a speed adjusting spring and a telescopic spring. Through mutual cooperation of the piston rod, the push rod, the reset spring, the oil pumping pipe and the annular spray head, the flying hammer can be better oiledand lubricated, the work intensity of workers is greatly reduced, and meanwhile the flying-out work efficiency is improved. Through mutual cooperation of the sleeve, the telescopic spring, the sliding rod and the push block, the sliding sleeve can be better connected, it is avoided that parts are disengaged due to work of the flyweight, and therefore the service life of the flyweight is greatly prolonged, and meanwhile the practicability of the flyweight is improved.