Dust-prevention buffer limiting component

The invention discloses a dust-prevention buffer limiting component which comprises a fixed seat and a limiting block, wherein the fixed seat is internally provided with a matching groove; the lower part of the limiting block is slidingly arranged in the matching groove; a buffer elastic piece matched with the limiting block is arranged in the matching groove; an umbrella-shaped shielding cap stretching downward is arranged at the upper part of the limiting block; and a step-shaped structure consisting of a plurality of circular tables is arranged at the upper surface of the fixed seat. The fixed seat is in a step-shaped structure consisting of multiple circular tables, the step-shaped structure is very stably after fixed, and the limiting block is also very stable on the fixed seat, so that deviation and inclining situations are avoided during working; and the shielding cap on the limiting block can effectively prevent dust and particles from falling on a connecting part between the limiting block and the matching groove, so that the abrasion is reduced, and the service life is increased.