The invention discloses a method for preparing high-oil absorption resin, which is characterized by adding a dispersant of polyvinyl alcohol, a precipitating reagent of cyclohexane, an emulsifying agent of sodium dodecylbenzene sulphonate, a single body of butyl methacrylate and stearyl methylacrylate, an initiator of potassium persulphate into deionized water, introducing nitrogen for deoxygenation, performing suspended emulsion polymerization, after reaction for a certain time, adding a cross-linking agent of diallyl phthalate, continuously reacting for at least two hours, performing cooling, separation, extraction by using an Soxhlet extractor for at least 12 hours and vacuum drying to obtain the products. By the aid of the preparation method of the invention, porous high-oil absorption resin can be obtained, which has oil-absorption capability to toluene reaching up to 24, and can be applied to the field of environmental protection and the like.