Boiler deaerator

The invention discloses a boiler deaerator, and relates to the field of boiler deaeration equipment, the boiler deaerator comprises a first box body, a second box body and a third box body, the second box body is fixedly installed below the first box body, and a flow dividing structure, an attachment plate and an oxygen detection and recovery structure are sequentially arranged in the second box body from top to bottom; the top face of the flow dividing structure is fixedly installed below the first box body, the flow dividing structure divides water flowing out of the first box body, the attachment plate is fixed to the bottom of the flow dividing structure, the oxygen detecting and recycling structure is fixedly installed at the bottom of the second box body, and the oxygen detecting and recycling structure comprises an elastic air bag and a supporting column. The elastic air bag is arranged on the outer side of the supporting column, an oxygen content sensor is arranged in the middle of the supporting colu