The invention relates to a method for synthetizing a white light polymer. The method comprises the following steps of: firstly, synthesizing 2,7-dibromo-9,9-dioctyl fluorene, 2,7-dithienyl-9-fluorenone and 2,7-di-2'-(5'-bromine)-thiophene-9-fluorenone by using an organic material, an inorganic material and a solvent by a four-step synthesis method; and finally synthesizing 9,9-dioctyl fluorine and dithienyl fluorenone copolymer, wherein a product is yellow powder, has the number-average molecular weight of 10,102, the weight-average molecular weight of 17,198, high color purity and excellent light-emitting performance, emits white light and has the color coordinates that x is 0.3340 and y is 0.3447. The synthesis method is advanced in process; chemical substances are mixed reasonably; process parameters are accurate; and the synthesis method is a method for synthesizing the white light polymer by using the organic, inorganic and solvent substances and can be directly used for manufacturing organic white light light-emitting diodes.