The invention provides a preparing method of dearomatizing resin spheres, and belongs to the technical field of adsorption separation. The method includes the steps that styrene and styrene modified monomers are mainly used as monomers, a crosslinking agent is used for low-degree crosslinking, and a space-occupying etching method is used for preparing the macropore dearomatizing resin spheres, wherein the molar ratio of crosslinking agent to styrene monomers and the molar ratio of styrene to modified monomers are 1:100-1:50 and 1:1-1:10 respectively. The raw materials of the preparing method of the dearomatizing resin spheres are easy to obtain, the synthesis conditions are simple, and the resin spheres are high in heat stability, convenient to recover and capable of being used repeatedly. The resin spheres are used in vegetable oil extraction solvent for dearomatizing and are expected to replace the prior art to prepare vegetable oil extraction solvent with the aromatic hydrocarbon content reaches or exceeds the international standard.