The invention relates to a preparation method of high oil-absorption resin, comprising the following steps of: (a) adding a polymer monomer mixture, water, an emulsifier and an initiator in a reactor, and stirring quickly to form a stable emulsion; (b) introducing nitrogen for protection; (c) heating a reaction system to 50 to 78 DEG C while stirring so as to perform emulsion polymerization reaction for 3.5 to 7.5 hours, and then continuing to heat the reaction system to 80 to 100 DEG C so as to perform curing reaction for 0.5 to 2.5 hours; and (d) carrying out conventional post-processing, cooling and filtering to obtain the product. The high oil-absorption resin prepared by the method has high oil-absorption ratio in allusion to jet fuel.