Improved horizontal decanter centrifuge

The utility model discloses an improved horizontal decanter centrifuge, which comprises a rotary drum, a spiral conveyor and a feed pipe, wherein the rotary drum is supported on a first bearing seat and a second bearing seat on a rack and comprises a first end part and a second end part, the spiral conveyor is coaxially arranged in the rotary drum, a separation cavity is formed between the rotary drum and the spiral conveyor, the first end part of the rotary drum and the corresponding end of the spiral conveyor are externally connected to a differential mechanism, through holes are formed at the axle center of the differential mechanism and the axle center of the spiral conveyor respectively, one end of the feed pipe is inserted into the through hole, the other end of the feed pipe is fixed on a support seat positioned on the rack in a still manner, a first centripetal pump for pumping the separated clear liquor out of the machine is arranged at the axle center at one end in the spiral conveyor, which corresp