To more surely prevent corrosion from occurring on the inside surface of a boiler heating tube and piping connected thereto.

The invention provides an equipment for boiler feedwater treatment. The equipment is constituted of a water feeding section 3, that supplies water to the boiler from a water storage section 2 and an aerator device 4 that introduces an inert gas into the water storage section 2 so as to supply the gas in the form of bubbles in the water are provided, and the tip end of a raw water introducing pipe 5 that introduces boiler raw water into the storage section 2 and the tip end of a condensed water introducing pipe 6 that introduces the condensed water of produced steam from the boiler into the storage section 2 are arrange to be inserted into the water of the storage section 2. In the equipment, an acid mixing section 11 is provided which can mix an acidic aqueous solution in the boiler raw water introduced through the raw water introducing pipe 5, while an alkali mixing section 12 is provided which can mix an alkaline aqueous solution in the stored water to be supplied to the boiler.