The utility model relates to the field of transportation of metallurgical slag ladles, in particular to a slag ladle top cover. The slag ladle top cover comprises a cover disc, and is characterized by also comprising a lifting lug, at least four pull rings and at least four guide sheets, wherein the lifting lug is arranged in the center on the top of the cover disc; the pull rings are uniformly arranged around the top surface of the cover disc; and the guide sheets are inclined wedge-shaped and are uniformly arranged around the bottom surface of the cover disc, and the inclined planes of the guide sheets face the axis of the cover disc. According to the slag ladle top cover, liquid-state substances in slag ladles can be prevented from flowing out during transportation; and meanwhile, the slag ladle top cover also has the effect of slowing down heat loss of the slag ladles.