The invention provides a magnetic seed magnetization dry-separation process for extracting iron from sintering dust. The process comprises the following main process steps: carrying out weakly-magnetic iron extraction on sintering dust by using a fully-sealed spiral dry magnetic separator with a field strength of 2000 Oe; adding 5 to 10% of flyash magnetic seeds into weakly-magnetic tail dust, carrying out heating to 70 DEG C, then carrying out hermetic and powerful mixing and magnetization, and allowing iron ions to realize magnetic aggregation with the magnetic seeds as a core; and carryingout separation by using a fully-sealed spiral dry magnetic separator with a field strength of 3000 Oe, and combining a weakly-magnetic concentrate and a concentrate separated through magnetic seed magnetization to form a comprehensive iron ore concentrate with a grade of 55% or more, wherein the magnetic seeds are not recovered and used as a sintering accessory together with the iron ore concentrate, and tail dust obtained after iron extraction is used as a raw material for extraction of useful elements such as K and Pb. The fully-sealed weakly magnetic and magnetic seed magnetization separation process is adopted in the invention for iron extraction, so iron resources in the sintering dust are recovered as much as possible; and the produced iron ore concentrate without alkali metals is used as a sintering accessory, so the problem that cyclic enrichment of alkali metals influences blast furnace production is overcome.