The invention discloses a preparation method of superparamagnetism easily-degradable oil stain absorption material and a product obtained by the method. The preparation method comprises the following steps: adding superparamagnetism Fe3O4 nano particles in a chiosan-acetic acid aqueous solution while stirring, wherein the mass ratio of the Fe3O4 nano particles to the chiosan-acetic acid aqueous solution is 2%-4%; then dropwise adding the obtained Fe3O4-chiosan -acetic acid aqueous solution in an equivoluminal 3%-5% sodium stearate aqueous solution for full reaction; and carrying out vacuum filtering on the obtained Fe3O4-chiosan-sodium stearate compound solution when the solution is hot, collecting filter cakes and drying so as to obtain superparamagnetism chiosan-sodium stearate polymerization clusters. The polymerization cluster has good oil absorbing capability, the volume of the absorbed oil is 10-15 times of that of the compound; and the compound after the oil is absorbed can continue to float on the water surface and can directionally drift under the guidance of a magnet.