A printing and dyeing wastewater treatment and reuse apparatus comprising: a coarse filter; a regulation pool; a hydraulic sieve; a desulfurization pool; a nanocatalytic electrolyzer; a flocculation pool; a settling pool; a flotation device; a biochemical pool; a secondary settling pool; a secondary nanocatalytic electrolyzer; a fine filter; a compressor; a nanomembrane assembly; and a recycling pool; wherein the coarse filter has an inlet and an outlet connected to an inlet of the regulation pool, an inlet of the desulfurization pool is connected to an outlet of the hydraulic sieve, a precipitate outlet of the desulfurization pool is connected to the compressor, an inlet of the nanocatalytic electrolyzer is connected to a wastewater outlet of the desulfurization pool, an outlet of the nanocatalytic electrolyzer is connected to an inlet of the flocculation pool, an outlet of the flocculation pool is connected to an inlet of the settling pool, a wastewater outlet of the settling pool is connected to an inlet of the flotation device, a precipitate outlet of the settling pool is connected to the compressor, a precipitate outlet of the flotation device is connected to the compressor, a wastewater outlet of the flotation device is connected to an inlet of the biochemical pool, an outlet of the biochemical pool is connected to an inlet of the secondary settling pool, a wastewater outlet of the secondary settling pool is connected to an inlet of the secondary nanocatalytic electrolyzer, a wastewater outlet of the secondary nanocatalytic electrolyzer is connected to an inlet of the fine filter, an outlet of the fine filter is connected to an inlet of the nanomembrane assembly, an outlet of the nanomembrane assembly is connected to the recycling pool for producing water for reuse, a condensate outlet of the nanomembrane assembly is for discharge, and impurities in the compressor are for discharge. a coarse filter; a regulation pool; a hydraulic sieve; a desulfurization pool; a nanocatalytic electrolyzer; a flocculation pool; a settling pool; a flotation device; a biochemical pool; a secondary settling pool; a secondary nanocatalytic electrolyzer; a fine filter; a compressor; a nanomembrane assembly; and a recycling pool; wherein the coarse filter has an inlet and an outlet connected to an inlet of the regulation pool, an inlet of the desulfurization pool is connected to an outlet of the hydraulic sieve, a precipitate outlet of the desulfurization pool is connected to the compressor, an inlet of the nanocatalytic electrolyzer is connected to a wastewater outlet of the desulfurization pool, an outlet of the nanocatalytic electrolyzer is connected to an inlet of the flocculation pool, an outlet of the flocculation pool is connected to an inlet of the settling pool, a wastewater outlet of the settling pool is connected to an inlet of the flotation device, a precipitate outlet of the settling pool is connected to the compressor, a precipitate outlet of the flotation device is connected to the compressor, a wastewater outlet of the flotation device is connected to an inlet of the biochemical pool, an outlet of the biochemical pool is connected to an inlet of the secondary settling pool, a wastewater outlet of the secondary settling pool is connected to an inlet of the secondary nanocatalytic electrolyzer, a wastewater outlet of the secondary nanocatalytic electrolyzer is connected to an inlet of the fine filter, an outlet of the fine filter is connected to an inlet of the nanomembrane assembly, an outlet of the nanomembrane assembly is connected to the recycling pool for producing water for reuse, a condensate outlet of the nanomembrane assembly is for discharge, and impurities in the compressor are for discharge.