The invention discloses an essence-safe boiler feedwater oxygenation processing method. The method comprises the following steps: 1) setting a feedwater processing mode before a thermal power unit copper-free system is oxygenized to be an ammonification processing mode; 2) closing an exhaust valve of a deaerator after meeting a certain condition; 3) carrying out oxygenation at an oxygenation point of the condensation water precision processing outlet of the unit; 4) controlling the content of water dissolved oxygen at an inlet of economizer to the range of 5-50 mu g/kg, wherein the content ofmaster steam chromate is no obviously increased as compared with that before oxygenation; 5) controlling the cation conductivity (1.5mu S/cm and [Cl-] (125 mu g/kg) of header boiler water below a drum boiler; 6) reducing the control range of the pH of stokehole feedwater at the temperature of 25 DEG C to 8.8-9.3 before the cubic centimeter (CC) of the stokehole feedwater is reduced to 0.15 mu S/cm; 7) before the operation of the unit stops, increasing the pH of the stokehole feedwater at the temperature of 25 DEG C to 9.3-9.6; and 8) blowing out the boiler and maintaining. By using the method, accidents caused by spalling of scale cinder of a steam through-flow system after feewater oxygenation can be effectively prevented.