The present invention discloses a palladium oxide catalyst for a direct formic acid fuel cell and a preparation method therefor. The preparation method is as follows: dissolving palladium chloride into an aqueous solution, and adding sodium citrate or potassium citrate to adjust the pH value of the solution to 9-13; then placing the above solution in a microwave reactor for microwave reaction for 3-30 minutes, while simultaneously performing reflux and magnetic stirring, to obtain a palladium oxide colloidal solution; after the palladium oxide colloid is cooled, adding a commercial carbon powder or carbon nanotubes to collect palladium oxide; and finally, performing suction filtration, and washing, vacuum-drying, and grinding of a filter cake, to obtain a carbon-supported palladium oxide catalyst. The present invention uses water as a solvent and is green and environmentally friendly, and no organic substance is involved in the reaction in the whole process; further, the invention does not add any protective agent with a high molecular weight, so that post-treatment is not required after the preparation of the catalyst, and it features a short reaction time and a reduced energy consumption. The process for preparing the palladium oxide electrocatalyst of the present invention is simple and facilitates mass production.
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