NOVELTY - Carbon supported palladium nanocatalyst, obtained by uniformly loading the palladium nanocatalyst on the composite material of modified carbon carrier, is claimed. The catalyst has activity of more than 1800 mAx mg-1Pd for formic acid electro-oxidation, where the concentration of palladium is 10-60 wt.%.    USE - The catalyst is useful as anode electrocatalyst in proton exchange membrane fuel cell including direct alcohol fuel cell and direct formic acid fuel cell.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the carbon supported palladium nanocatalyst, comprising (i) mixing carbon carrier, a water-absorbing agent and an oxidant of specific mass ratio, adding sulfuric acid or phosphoric acid solution as dispersing medium, reacting completely by stirring under heating conditions, diluting by adding deionized water, filtering in vacuum, washing with water and vacuum drying; (ii) mixing the resulting product with an oxidant, adding sulfuric acid or phosphoric acid solution as dispersing medium, stirring to react completely, diluting by adding deionized water, adding hydrogen peroxide to a mixed system to obtain bright yellow solution, filtering the reaction liquid, washing with hydrochloric acid, then washing with water to neutral, examining the filtrate for chlorine ions using silver nitrate solution, and drying in vacuum to obtain the modified carbon carrier; (iii) mixing palladium chloride and a complexing agent in a solvent to form a palladium complex, dispersing the modified carbon carrier in mixed solution of water and glycol or aqueous solution of palladium complex, subjecting to ultrasonic treatment or stirring, adding large amount of reducing agent, controlling the temperature, stirring to react completely, examining the filtrate for chlorine ions using silver nitrate solution, and drying in vacuum; and (iv) placing the modified carbon supported palladium nanocatalyst in the protection of an inert gas, raising the temperature and processing, processing in the protection of inert gas and naturally cooling to the room temperature.