The invention discloses a particle electrode for treatment of refractory organic wastewater particle and a preparation method for the particle electrode. The electrode comprises granular active carbon as well as Mn, Co and Ce supported on the granular active carbon. The preparation method comprises the following steps: pretreatment of powdered activated carbon, preparation of a composite impregnation solution, supporting of the powdered activated carbon onto metal oxide and granular active carbon forming. According to the preparation method, the step of doping of metal oxide into the particle electrode is performed before the step of forming, and the prepared particle electrode has the advantages of stable structure, simple preparation method, low manufacturing cost and the like, and is applied to a three-dimensional electrode reactor to effectively treat refractory organic wastewater.