The present invention discloses a combined centrifugal device, including: a tubule； and a negative pressure storage chamber configured to generate a negative pressure and store a suspension, wherein the negative pressure storage chamber is in communication with the tubule so that the negative pressure storage chamber generates a negative pressure to suck the suspension into the negative pressure storage chamber and the tubule through the tubule； wherein the tubule is provided with a fixing means through which the combined centrifugal device is fixed to the centrifugal machine. In such a way, the present invention fixes the combined centrifugal device to the centrifugal machine by means of the fixing means, so that the centrifugal machine can use the tubule to store the rare content of ingredients in the suspension during centrifugation to directly enlarge the thickness of the rare content of ingredients in the suspension in the tubule, therefore, the rare content of ingredients in the suspension is effectively thickened and stratified.
