Treatment method and device of industrial wastewater

The invention relates to a treatment method of industrial wastewater, wherein the method comprises the following specific technological process: high-salt and high-COD concentrated water enters an advanced oxidation reactor through a sewage pump, and the advanced oxidation reactor is internally provided with a special catalyst layer and a catalyst support layer from top to bottom successively, the catalyst support layer is internally filled with activated alumina based multi-phase catalyst with the particle size of 5-15 cm, and the specific catalyst layer is internally filled with a specific catalyst; the high-salt and high-COD concentrated water undergoes a full mixed reaction with ozone provided by a plasma generator in the advanced oxidation reactor, and effluent after the reaction is directly discharged to the outside; tail gas is treated successively through a gas-liquid separation tank, a pre-oxidation tank, an ozone annihilator/ozone destructor and a cold drying and filtration system, and then enters a