The invention provides a horizontal spiral settling disc centrifuging machine. A spiral wheel of the horizontal spiral settling disc centrifuging machine comprises a high sealing section, a first settling section and a disc settling section, wherein a scraping cutter is arranged in the middle of the high sealing section by a locating pin and a positioning bolt in a passing manner; a slag hole is formed at the right side of the scraping cutter inside a rotary drum; a slag discharge pipe is arranged exactly below the slag hole; and a plurality of discs stacked are arranged in the disc settling section. The horizontal spiral settling disc centrifuging machine is simple in structure and reasonable in design, can cause solid particles in a liquid phase to settle down in a separation process through double settling and separation and can greatly improve the recovery rate of solids.