The trolley-mounted dust separator cyclone. Field of application: the trolley-mounted CYCLONFILTER extractor-filter unit is used in all cases where the working conditions of the felt filters or cartridges must be improved by means of cyclonic pre-filtering of the dusts with larger particles. It is of particular interest to the following industries: engineering (grinding, polishing, deburring etc...), of rubber and plastic, wood, chemical, fabric, agricultural, food, etc. Operating principle: the polluted air is extracted by the electric fan positioned on the outlet of the cyclone into whose easily removable lower box, the heavier particles fall. Successively, the finer dusts are withheld in a module made up from 2 filtering bags or 1 cartridge (CYCLONFILTER 1 C) or in 2 modules with 4 filtering bags or 2 cartridges (CYCLONFILTER 2C). Using the cartridge filters, the lower bags must be replaced with plastic collection bags.