The invention relates to the technical field of air dust removal, in particular to an internal and external
cyclone reverse
shunting-type air dedusting method and device, and solves the technical defects that existing
cyclone centrifugal dust removal devices are complex in structure and large in size. According to the technical scheme, a shell is divided into an air inlet dust collection section, a
cyclone reverse
shunting section and an air exhaust section, the air inlet dust collection section comprises an air inlet
barrel and a dust collection box, and the cyclone reverse
shunting section comprises a packing ring, a flow deflector, a fixed plate, a driving shaft and a centrifugal
impeller. The device has the beneficial effects that: the centrifugal
impeller drives dust-containing air to move to form rotationally-rising inner cyclone, particle impurities in the dust-containing air radially settle under the action of
centrifugal force and gravity to form external
airflow, clean air rises to the upper end of the centrifugal
impeller and enters the exhaust section through a radial air
inlet channel and a radial air outlet channel, a small amount of clean air is shunted and returned under the action of the flow deflector and drives external
airflow to rotate and descend to form outer cyclone, most of the impurities settle in the dust collection box, a small amount of the impurities converges into inner cyclone, and the device is good in dust removal effect, simple in structure and small in size.