The invention relates to a centrifugal separator (2) for separating liquid from airflow carrying liquid or steam, which is provided with a flow path (14) limited by a secured inner shell (16) and aligned along an axial direction (18), where the separator (8) should be provided with particularly silent working property with less vibration under a condition of high separating efficiency. Therefore, according to this invention, the centrifugal separator (2) is provided with plural liquid collecting chambers (38) arranged one by one in the axial direction (18) in an area of a separated section (8) and disposed respectively around the inner shell (16) circularly, and sealed by a divided plate (36) to each other respectively, wherein each liquid collecting chamber (38) is connected with the flow path (14) through plural through holes (26) led into the inner shell (16) by flow technology.