The invention provides a method for preparing 2,2'-bis[4-(4-maleimidophenoxy)phenyl]propane. The method comprises the steps of carrying out an amidation reaction and a dehydration close-loop reaction in a manner of taking maleic anhydride and 2,2'-bis[4-(4-aminophenoxy)phenyl]propane as main raw materials, taking a strong protonic acid as a catalyst, taking benzene or a derivative thereof and a high-boiling-point polar non-aprotic formamide di-substitutendum as solvents and taking phenols as a polymerization inhibitor, thereby preparing the 2,2'-bis[4-(4-maleimidophenoxy) phenyl]propane. According to the method provided by the invention, the process is simple, wastewater, obtained after water washing liquid separation, is subjected to distilling recovery and is not discharged as a pollutant, and residues, obtained after distillation, continue in service as a raw material of a next-batch reaction, so that the cost is reduced; the purity of the prepared product reaches up to 99.0% to 99.7%.