Integrated dyeing wastewater treatment device and treatment method thereof

The invention relates to an integrated dyeing wastewater treatment device and a treatment method thereof. The device comprises a wastewater treatment module, a sludge treatment module and a methane recycling module. The treatment method comprises the following steps: degrading pretreatment wastewater with anaerobic bacteria in a spirally symmetrical flow anaerobic reactor, and performing oxidation-reduction reaction on dyeing wastewater with anaerobic microorganisms in an efficient decoloring anaerobic reactor so as to promote dye reduction; performing nitrification-denitrification denitrogenation treatment on the obtained wastewater in an airlift external-circulation vortex enhanced biological denitrification reactor, mixing obtained biochemical sludge with sludge from physical-chemical treatment, then performing dehydration, and performing hydrothermal reaction in a hydrothermal reactor so as to realize pyrohydrolysis of degradation-resistant particles to obtain easily degradable organic matters; finally de