Abstract: The application discloses a non-contact self-impact seal efficient in throttling and fixed in clearance. The non-contact self-impact seal is formed by assembling a stationary ring, a rotating ring and hanging pillars; the stationary ring, the rotating ring and the hanging pillars are all rigidly fixed; the hanging pillars are respectively arranged in the stationary ring or the rotating ring according to an assembly relationship; a fluid channel is formed by a non-contact clearance formed after the stationary ring, the rotating ring and the hanging pillars are rigidly fixed; the fluid channel is composed of an inlet, an outlet and a stacked arrangement structure; the non-contact self-impact seal is arranged in a stacked manner, series arrangement can be achieved, the stage arrangement and the throttling efficiency are more efficient, a clearance seal and a labyrinth seal under the same working condition and parameters.