The invention relates to a coking wastewater biological denitrificaion treatment process, belonging to the technical field of environmental protection and wastewater processing, which is characterized in that the biological denitrificaion treatment process with A/O/A/O, namely, anoxia/oxic/ anoxia/oxic as the core is adopted. The pretreated coking wastewater sequentially enters into a first-level anoxic tank, a first-level oxic tank, a reflow sedimentation tank, a second-level anoxic tank, a second-level oxic tank, a second-level sedimentation tank, short-range nitrification and denitrification biological denitrificaion treatment are carried out on the coking wastewater in the first-level anoxic tank and the first-level oxic tank, hydrolysis acidification and fine denitrification treatment are carried out on the coking wastewater in the second-level anoxic tank, and the second-level oxic tank realizes the full nitration reaction. The process method has stable operational effect, low operational cost, high denitrification percent, water-quality indexes such as CODCr, NH3-N and the like of water from the second-level sedimentation tank can simultaneously reach a first-level discharge standard in Integrated Wastewater Discharge Standard (GB8978-1996), and can be recycled and used by other users after advanced treatment, thus realizing the zero discharge of the coking wastewater.