TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The concentration of the chloroplatinic acid aqueous solution is 30-50 mmol/l. The shape of manganese oxide carrier is silkworm cocoon shaped, sea urchin shaped or bird nest shaped. The particle size of platinum nanoparticle is 0.1-5 nm. Preferred Method: The preparation of the silkworm cocoon shaped manganese oxide carrier, comprises separately weighing manganese sulfate monohydrate and potassium permanganate in a molar ratio of 3:2, separately and completely dissolving them in water under stirring condition, dripping the prepared potassium permanganate aqueous solution into the prepared manganese sulfate monohydrate aqueous solution, stirring them for 6 hours at room temperature until the black product is obtained, centrifugally separating the black product, washing the obtained precipitate, drying the washed product to obtain silkworm cocoon shaped manganese oxide carrier. The method for preparing the sea urchin shaped manganese oxide carrier, comprises separately dissolving manganese sulfate monohydrate and potassium permanganate in a molar ratio of 3:2 in water under stirring condition, adding concentrated sulfuric acid into the prepared manganese sulfate monohydrate aqueous solution, dripping the prepared potassium permanganate aqueous solution into the prepared manganese sulfate monohydrate aqueous solution containing concentrated sulfuric acid in a molar ratio of 1:5, stirring for 24 hours at 80 degrees C to obtain blackish brown product, centrifugally separating the blackish brown product, washing the obtained precipitate, drying the washed product to obtain the sea urchin shaped manganese oxide carrier. The method for preparing the bird nest shaped manganese oxide carrier, comprises separately dissolving manganese sulfate monohydrate and potassium permanganate in a molar ratio of 3:2 in water under stirring condition, adding concentrated sulfuric acid into the prepared manganese sulfate monohydrate aqueous solution, dripping the prepared potassium permanganate aqueous solution into the prepared manganese sulfate monohydrate aqueous solution containing concentrated sulfuric acid in a molar ratio of 1:5, reacting for 12 hours at 120 degrees C to obtain blackish brown product, centrifugally separating the black brown product, washing the obtained precipitate, and drying to obtain the bird nest shaped manganese oxide carrier. ORGANIC CHEMISTRY- The degree of polymerization of polyvinyl pyrrolidone is 10-1000.