A novel high gravity electrochemical reactor with multi-concentric cylindrical electrodes was used in the electrochemical treatment of 5000 mg/L phenol-containing wastewater at a petrochemical plant,which can operate continuously and process in a large scale.The results show that the high gravity technology used in electrochemical treatment of phenolcontaining wastewater can shorten the electrolysis time,decrease the electrolysis voltage,and reduce the energy consumption.The COD removal efficiency was high in the high-gravity field,and reached up to about 48％,which was about 2 times the value achieved in the normal gravity field at a processing capacity of 6 L,a high gravity factor of 80,a voltage of 12 V,an electrolysis time of 40 min,and a wastewater flowrate of 80 L/h.