The invention relates to a boiling type granular layer filter dust separator. The boiling type granular layer filter dust separator comprises an outer shell and at least one filter device vertically arranged in the outer shell, wherein the filter device comprises at least one filter unit, the filter unit comprises an inner shell, a filter chamber, a sieve plate, a filter bed and a reverse blowing device; the filter chamber is formed by surrounding of the inner shell and the sieve plate, the reverse blowing device is arranged in the filter bed, the reverse blowing device comprises an upper-layer reverse blow-gun component, a lower-layer reverse blow-gun component and a reverse blowing side baffle, the upper reverse blow-gun muzzle direction of the upper-layer reverse blow-gun component is downwards inclined, the lower reverse blow-gun muzzle direction in the lower-layer reverse blow-gun component is horizontally arranged. According to the technical scheme, the structure is simple, the arrangement is flexible, the operation cost is low, the dust removal efficiency is high, and the dust separator is suitable for most of high-temperature dust removal occasions, and is strong in feasibility, practicability and economy.