The invention discloses a DC boiler feed water selective oxidation treatment process. In conventional DC boiler feed water oxidation processes, the phenomenon that much oxide skin on the surface of a superheater and a reheater falls off exists. In the invention, the DC boiler feed water selective oxidation treatment process is adopted, and is characterized by comprising two stages of selective oxidation treatment on boiler feed water, wherein the two stages are a selective oxidation transformation stage and a selective oxidation stable-film repair stage respectively. Oxygen is added at an outlet of a condensed water fine treatment system, wherein the amount of the oxygen is controlled according to the requirements of a conventional oxygen addition process; and when a feed water line is completely oxidized and the selective oxidation stable-film repair stage is executed, the amount of the added oxygen is reduced and the added oxygen is only used for repairing an oxidation film on the feed water line. The DC boiler feed water selective oxidation treatment process has the advantages of ensuring that the metallic surfaces of pipelines at the inlets of a feed water system and an economizer are transformed and repaired, reducing the iron content of the feed water, fulfilling the aim of feed water oxidation treatment, ensuring no oxygen in steam and avoiding the problem on the oxide skin of the superheater and the reheater.