The invention discloses a technological method for treating coking wastewater. The technological method comprises the following steps that (1) coking wastewater is subjected to ammonia distillation and oil-water separation sequentially; (2) coking wastewater after oil-water separation is subjected to water quality regulation; (3) coking wastewater after water quality regulation enters an iron+activated coke reactor for iron-carbon micro-electrolysis and suspended particles in the coking wastewater are absorbed; (4) coking wastewater flowing out of the iron+activated coke reactor is subjected to biological removal of nitrogen and organic pollutant removal treatment; (5) coking wastewater after biochemical treatment is subjected to coagulating sedimentation for mud-water separation; (6) mud after mud-water separation is subjected to thickening and dehydration treatment, and the coking wastewater after mud-water separation is subjected to deep ozonation treatment; the technology operates stably, the cost is low, the treatment efficiency is high, the load capacity resistance is high, and the operation is easy.