NOVELTY - Graphite oxide and polyethylene glycol-ethylene glycol mixed solution in volume ratio of 10:30-15:30 are dispersed to obtain solution (A). Hydrogenchloropalladate and polyethylene glycol-ethylene glycol mixed solution in volume ratio of 10:20-15:20, are mixed to obtain solution (B). Obtained solution (A) and solution (B) are stirred in volume ratio of 30:30-30:35, sodium hydroxide solution is added and pH value of the resultant solution is adjusted to 9-12. Resultant solution is stirred, reacted, filtered, washed by ethyl alcohol and water and dried, to obtain palladium nanoparticles.    USE - Preparation of palladium nanoparticles used as electrocatalyst.    ADVANTAGE - The method economically provides palladium nanoparticles having excellent dispersibility, by a simple process without addition of surfactant and reducing agent. The palladium nanoparticles are environmentally-friendly.    DETAILED DESCRIPTION - Graphite oxide and polyethylene glycol-ethylene glycol mixed solution in volume ratio of 10:30-15:30, are ultrasonically dispersed, to obtain solution (A). 0.0625 mol/L Hydrogenchloropalladate and polyethylene glycol-ethylene glycol mixed solution in volume ratio of 10:20-15:20, are mixed, to obtain solution (B). The ratio of polyethylene glycol and ethylene glycol in the polyethylene glycol-ethylene glycol mixed solution is 1-3:1. The obtained solution (A) and solution (B) are stirred in volume ratio of 30:30-30:35 under magnetic force, sodium hydroxide solution is added, and pH value of the resultant solution is adjusted to 9-12. The resultant solution is stirred uniformly for 30 minutes, transferred to a 500 mL beaker, and reacted for 5 minutes. The resultant reaction mixture is naturally cooled at room temperature, filtered by a sand core funnel and heated at 140 degrees C for 5 minutes in a microwave oven. The resultant dried product is alternatively washed using absolute ethyl alcohol and deionized water for 5 times and dried at 60 degrees C for 6 hours under vacuum, to obtain palladium nanoparticles.