A centrifuge feed mechanism is applied to the petroleum chemical industry centrifuge feed. A flange is welded on an outer end portion of a feed tube, a hexane tube is welded on the upper portion of the inner wall of the feed tube and is parallel to the feed tube, and two ends of the hexane tube are closed. The outer end portion of the feed tube is provided with a hexane inlet joint in a welded mode and the hexane inlet joint is communicated with the interior of the hexane tube. A hexane first flushing hole and a hexane second flushing hole are arranged on an inner end of the feed tube. Two holes are arranged on the hexane tube, the hexane first flushing hole and the hexane second flushing hole are respectively opposite to the two holes, and the hexane first flushing hole and the hexane second flushing hole are respectively communicated with the interior of the hexane tube. The centrifuge feed mechanism has the advantages that a hexane liquid seal is formed when the centrifuge runs, the flushing effect can be reinforced by means of the increasing of the hexane flushing flow rate, and the problem of material reverse rolling which is caused after the centrifuge feed tube dry gas seal is modified is solved.