The invention discloses an engine mute air distribution system and an engine. The air distribution system of the engine is of a cam ejector rod structure, and the lift range of a cam is less than 6. The engine mute air distribution system reasonably optimizes the lift range of the cam, reduces the maximum lift range of the cam, and smooth curve transition is adopted according to the general designrule of the cam, so that acceleration of a curve in a working section is as smooth as possible, the impact, vibration and abrasion of the air distribution system are reduced, the service life of thewhole air distribution system is prolonged, the sound quality is improved, and the overall low-noise and high-efficiency operation of the engine is further ensured.