The invention discloses a method for preparing strawberry-shaped precious metal-cerium oxide nano particles, an obtained product and application. The method comprises the steps of adding cerous salt and a precious metal precursor into an organic solvent solution of an amphiphilic segmented copolymer, and forming a composite micelle; adding a reverse micelle solution containing strong base and an amphiphilic segmented copolymer into the composite micelle solution, causing trivalent cerium ions and the precious metal precursor to undergo oxidation-reduction reaction in the alkaline environment, and forming the strawberry-shaped precious metal-cerium oxide nano particles. The product has a large specific surface area, the problem that precious metal nano particles are lost easily during gathering and use and during high-temperature treatment is solved, and the catalytic performance of a nanometer material is improved to a certain extent.