Organic wastewater treatment device

The utility model discloses an organic wastewater treatment device which comprises a raw water pretreatment system, a multi-stage oxidation system, an ozone generation system, a dosing system, a tail gas absorption device and a backwashing water system, the raw water pretreatment system comprises a raw water tank, a water inlet pump, a water inlet flow meter and a filter which are connected in sequence; the multi-stage oxidation system comprises a first-stage oxidation tank, a second-stage oxidation tank, a third-stage oxidation tank and a fourth-stage oxidation tank which are sequentially connected, a water outlet of the filter is communicated with a water inlet of the first-stage oxidation tank, and microporous aeration discs are mounted in the first-stage oxidation tank, the second-stage oxidation tank, the third-stage oxidation tank and the fourth-stage oxidation tank; the upper end face of the first-stage oxidation tank is communicated with a microporous aeration disc in the second-stage oxidation tank t