The invention provides a separation device. The device is to solve the problems of low efficiency, high operation pressure resistance and high cost of a conventional separation device. The separation device comprises a peripheral cavity, dust collecting plates and vortex generating plates, wherein the peripheral cavity comprises an inlet end and an outlet end; and the dust collecting plates are arranged in the interior of the peripheral cavity, and comprise at least one layer of a cylindrical dust collecting plate. According to the invention, particle-contained airflow flows into the peripheral cavity from the inlet end; when the airflow flows through the vortex generating plates, the vortex generated by the vortex generating plates enables a part of particles to be carried to the dust collecting plates and adsorbed on the dust collecting plates; and particle-removed airflow flows out of the peripheral cavity from the outlet end. The separation device provided by the invention has the advantages of high separation efficiency, low operation pressure resistance, simple structure and low cost.