The invention provides a matched dust removal device matched with an ash inlet and outlet of a garbage incinerator. The matched dust removal device matched with the ash inlet and outlet of the garbageincinerator comprises a clearance hole and a flow guide ring, wherein a scraping base is of a shaft sleeve structure, the right side of an inner cavity of the scraping base is mounted with a mountingbase in a sleeve mode, and the right end surface of the mounting base is further provided with a lengthened rod in a spot welding mode; and the rod wall of the lengthened rod is mounted with a dust blocking cover in a sleeve mode, and the inner cavity of the dust blocking cover faces to the left. The dust removal device of the structure is simple in structure, is of a hand-rotating structure, andcan be applied to the discharge of accumulated ash in the pipe orifice section of an ash removal pipeline, the middle section is of a core steel wire brush structure and mainly bears scraping and cleaning work of the inner wall of the pipeline, and the right side is the dust blocking cover capable of axially adjusting along with the cleaning work; and during use, the ash scraped from the inner wall of the pipeline by the middle section can be synchronously pulled out by a functional plate and a functional pipe for scraping and pulling on the left side, the comprehensive constitutive propertyis good, due to the dust blocking of the dust blocking cover with a reasonable structure, the working process is more environment-friendly and reasonable.