Process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater

The invention belongs to the technical field of wastewater treatment, and particularly relates to a process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater, which comprises the following steps of: transferring the high-salinity wastewater into a pH regulating tank with a stirring function, adding acid while stirring the high-salinity wastewater, inputting effluent into a Fenton oxidation tank by a lifting pump, adding H2O2 and ferrous sulfate into the Fenton oxidation tank, fully conducitng stirring, enabling the effluent to automatically flow into an activated carbon adsorption tank, adding powdered activated carbon with the corresponding mass being 3-6 times of the COD mass concentration, fully conducting stirring, enabling the effluent to automatically flow into a concentrated water tank, adding alkali while stirring, inputting wastewater into a tubular microfiltration system through a circulating pump, and after filtration treatment, enabling water produced by a tubular ultrafiltrati