Abstract: The dust collecting device in ZL41 filter rod combiner is designed on the basis of that in YJ14 cigarette maker, the bag filter works unstably and dust cleaning means is obsolete, which result in poor dust cleaning effect and short working life. Therefore, the filter material and system structure were improved. By adopting pleated polyester resin filter cartridge, the filter area was tripled comparing with flannel bag filter. Fan, electric control assembly and electromagnetic valve were configured in the system, and compressed air was introduced. The dust collector was divided into 5 sections, i.e. blowing, filtering, dust collecting, electric control and clear air. The results of application showed that comparing with the dust collector in YJ14 cigarette maker, the designed air volume, filtering area of the improved dust collector increased by 1500 m³/hour and 24.5 m², respectively, which featured stable filtering performance and good cleaning effect. The working life of filter cartridge was over 3 years, maintenance work was reduced.