Combined dust removal system

The utility model discloses a combined dust removal system, including cyclone dust collector, seal connecting piece, bag-type dust collector and reflux unit, seal connecting piece includes connecting shell, the exhaust pipe of cyclone dust collector middle upper end passes through connecting shell up and down, exhaust pipe and connecting shell fixed connection, and the connecting shell is connected with the bag-type dust collector. A bag-type dust collector with the bottom open is arranged at the upper end of the connecting shell, and dust collecting hoppers are evenly distributed at the bottom of the connecting shell. The combined type dust removal system adopts a combined type integrated structure, is small in occupied area, can utilize the space on the upper side of a workshop, can enable dust-containing airflow to sequentially pass through the cyclone dust collector and the bag-type dust collector so as to carry out two-time dust removal operation, and can carry out backflow and re-dust removal operation