The invention provides multi-functional efficient oil scavenge polymer which is characterized by being a copolymer formed by copolymerizing monomer acrylamide, crylic acid or 2-acrylamide-2 methyl-1-propanesulfonic acid and monomer graft modification starch. Content of acrylamide and crylic acid or 2-acrylamide-2 methyl-1-propanesulfonic acid occupies, by mass, 60-90% of total mass of two monomers, and the two monomers occupy 30-60% of total mass. Alkyl halide is added in the process of preparation of the monomer graft modification starch. Productivity of the multi-functional efficient oil scavenge polymer reaches more than 90%, is efficient, environment-friendly and high in interfacial activity, enables oil-water interface tension of oil reservoir crude oil to arrive at 10-2-10-3Mn / m, and is free of dehydration after 24-hour emulsification, rapid in demulsification, high in temperature resistance and shear resistance, non-toxic, environment-friendly and good in biodegradability. Alkyl halide is added in the process so as to enable water absorption rate of the prepared monomer graft modification starch to be higher.