The invention discloses a height-adjustable horizontal spiral centrifuge. The height-adjustable horizontal spiral centrifuge comprises a rack and a carrying rod, wherein the carrying rod is at the bottom of the rack; supporting legs I are fixedly connected at four corners of the bottom of the rack; supporting legs II sleeve the bottom ends of the supporting legs I; the two ends of the carrying rod are fixedly connected with connecting rods at the tops of the supporting legs II; the two ends of the connecting rods are fixedly connected on the side surfaces of the supporting legs I; a supporting plate is fixedly connected on the inner sides of the supporting legs II; a drive rod I is inserted in the supporting plate; and a drive rod II is movably connected in the drive rod I. According to the height-adjustable horizontal spiral centrifuge, the carrying rod, the connecting rods, the supporting plate, the drive rod I, the drive rod II, a disc, a connecting block, a fixed rod I, a cylinder and a fixed rod II are arranged, the effect of adjusting height of the horizontal spiral centrifuge is achieved, height of the horizontal spiral centrifuge can be increased, treated sewage is conveniently discharged, and efficiency for discharging clean water is improved.