Abstract: The EEZVI-UASB technique was used for processing swine wastewater and for studying the correlation among EEZVI electrode voltage, concentration of organic matters and denitrification rate of contribution to solve the passivation of ZVI electrode surface and realize the stable and efficient operation of the anammox technique. The results showed that the starting time needed by the technique for processing swine wastewater was shorter at (35±1) ℃, pH 6.80-7.10 and electrode voltage 0.60 V. The removal rates of NH₄⁺-N and NO₂^--N were able to keep at a high level, with removal rates of >90.00% for NH₄⁺-N and >96.00% for NO₂^--N, and an average removal rate of TN>90.00%. When EEZVI electrode voltage was 0.60 V, AAOB activity was 91.10 mg/(g·d). In the EEZVI-UASB system, the dominant bacteria belonged to the genus of Pseudomonas, as confirmed with a similarity value of 97% by PCR amplified 16S rDNA analysis. Reactions like denitrification, anaerobic ammonium oxidation and methanation occurred simultaneously, but the dominant reaction was anammox, whose contribution rates for TN removal were 54.10%-93.30%. The contribution rates of denitrification and other reactions for TN removal were 6.70%-45.90%.