The present invention provides a thermally activated delayed fluorescence material, a method of synthesizing the same and an OLED device using the same. The thermally activated delayed fluorescence material includes a structure formula 1 as wherein the group Ar1 is identical to or different from the group Ar2, and the group Ar1 and the group Ar2 are consisted of carbazole and/or phenothiazine. The thermally activated delayed fluorescence material has a higher glass transition temperature, high thermal stability and excellent luminous efficiency. The method of synthesizing the same has simplified steps, easily purified product, high yield, and luminous and thermal properties of the product can be adjusted by connecting to differentiated functional groups. The OLED device using the same has a light emitting layer of high fluorescence efficiency and long-term stability, so that luminous efficiency and service life of the OLED device can meet practical demand.