The invention relates to a method for producing low-sulfur pig iron for steel manufacture by using a rotary hearth furnace. The method uses low grade iron ore powder, a carbonaceous reducing agent, limestone, fluorite, soda and an organic binder as raw materials for pelletizing; the materials are subjected to preheating, reduction, melt-phase separation and cooling in the rotary hearth furnace to realize iron and slag separation; and the materials are discharged, subjected to secondary cooling, first screening, crushing, second screening and magnetic separation to achieve recovery of grate-layer material and separation of iron and slag, so as to obtain high-quality low-sulfur iron beads. The method provided by the invention achieve rapid reduction and melt-phase separation of carbon-containing pellet by adjusting the slag system, adding a sulfur fixing agent and optimizing temperature and air flow in the rotary hearth furnace, so as to obtain the lower-sulfur iron bead, which can be used as fine raw material for electric furnace or converter steelmaking. The method has the advanategs of low temperature for melt-phase separation and short time for high temperature maintenance, thereby reducing energy consumption.