The invention discloses a creeping agent used for processing high-sulfur iron melt to produce vermicaular graphite cast iron, containing the components in weight percent: rare-earth (RE) 15-35%, magnesium (Mg) 2-6%, silicon (Si) 35-45%, aluminum (Al) 1-5%, calcium (Ca) 1-5%, zinc (Zn) 0.5-2.5%, barium (Ba) 0.5-2.5%, and iron (Fe) the rest. It is melted of the raw materials of rare-earth silicon iron alloy, metal Mg, SiCa, SiBa, Al ingot, Zn ingot, etc. The invention has the characters of simple operation, good solubility, stable reaction, high absorptivity, high creeping rate, stable creeping effect, and strong anti-decay ability, and can meet the requirements of producing casts at different wall thicknesses, has wide marketing prospect and remarkable economic benefits.