The invention relates to a transverse moving type molten iron stirring and desulfurizing system. The transverse moving type molten iron stirring and desulfurizing system comprises a structure platform, wherein two tank conveying track lines are arranged under the structure platform in parallel and are applied to walking of molten iron tank cars; each tank conveying track line is correspondingly provided with a stirring station node; two through holes for passing of a stirrer are formed in the structure platform; a transverse moving track connected in series with the two through holes is distributed on the structure platform; the two through holes directly face two stirring station nodes in a one-to-one correspondence manner; a transverse moving trolley walks on the transverse moving track;the stirrer and a lifting mechanism used for driving the stirrer are arranged on the transverse moving trolley. According to the transverse moving type molten iron stirring and desulfurizing system,the transverse moving track is arranged; the transverse moving trolley drives the stirrer to move between the two stirring stations, so that two sets of desulfurizing stations share one set of stirring device; the molten iron stirring and desulfurizing system is transversely arranged; only two stations are occupied; the occupied space and the equipment cost are effectively reduced.