Electricity catalytic oxidation reactor, relate to the sewage treatment field, which comprises a housin, the inlet tube of casing upper end, with advance the water distribution device that water piping connection set up in the casing nearly top, set up the packing layer in the casing, set up the electrode on casing filler interval lateral wall, the casing bottom is provided with the outlet pipe, the nearly bottom of casing is provided with aeration equipment, water distribution device below is provided with the one deck and crosses the filter pulp, cross that the filter pulp is fixed to be covered in the first plastic frame of lattice -shaped, first plastic frame below packing layer top is provided with the second plastic frame, first and second plastic frame constitutes steady water layer within a definite time, the packing layer bottom is provided with the third plastic frame, aeration equipment sets up in third plastic frame below. Simple structure, the water distribution is even, current efficiency is high, the handling capacity is big, the energy consumption is low.