a method of manufacturing of a polymer composite includes the steps of putting a nanofiller and a polymer material in a high - pressure device and eliminating air therefrom ; providing a gas in the high - pressure device and performing a heating and blending process on the nanofiller and the polymer material at a first pressure and a first temperature ; changing the pressure and temperature of the high - pressure device to a second pressure and a second temperature to thereby obtain a polymer composite ; and performing a degassing process on the polymer composite . accordingly , the method is effective in manufacturing a polymer composite which includes a uniformly dispersed nanofiller .