The invention discloses a multistage ferric-carbon microelectrolysis coupled Fenton oxidation bed reactor. The multistage ferric-carbon microelectrolysis coupled Fenton oxidation bed reactor is characterized by comprising a lifting water pump, a water inlet pipeline, a hydrogen peroxide dosing device, a water inlet pipeline mixer, a water distribution chamber, a multistage ferric-carbon microelectrolysis coupled Fenton oxidation bed reactor body, a material taking and replacing port, an elemental iron and granular activated carbon mixture layer, an outlet water clarification zone, a sieve plate water distribution system, a sludge discharging opening, a reactor draining ditch, a water outlet pipe and a precipitation tank, wherein the precipitation tank comprises a precipitation tank body, a water outlet pipeline and a sludge discharging pipeline. According to the multistage ferric-carbon microelectrolysis coupled Fenton oxidation bed reactor disclosed by the invention, the problems of the traditional coking wastewater treatment processes that COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen and chromaticity in outlet water do not reach the standards and the like due to the fact that the effect of removal of refractory and complicated organic pollutants is not ideal are solved, and the treatment on refractory polycyclic and heterocyclic organic substances and toxic and harmful substances in wastewater is extremely effective.