A milk powder box (A-52), milk powder blending device (A-50) using the milk powder box (A-52), and an auxiliary blending method for milk powder the upper portion of the milk powder box (A-52) is connected to a nipple, and connected to a feeding bottle (A-51) via a second connection mechanism (A-524) the milk powder box (A-52) has a milk powder outlet (A-526) and a milk powder outlet valve (A-523) operating on the milk powder box (A-52) via an operation part allows the milk powder outlet (A-526) to move relative to the milk powder outlet valve (A-523) to open or close the milk powder outlet (A-526) when a relative movement causes the milk powder outlet valve (A-523) to block the milk powder outlet (A-526), the inner cavity of the milk powder box (A-52) forms a milk powder accommodation cavity sealed and isolated from the inner cavity of the feeding bottle (A-51) for accommodating milk powder when the milk powder outlet (A-526) is moved to an open state, at least one position allows the formation of a milk powder channel between the milk powder box (A-52) and the feeding bottle (A-51) through the milk powder outlet (A-526), the milk powder channel being sealed and isolated from the external environment, and allows the formation of a milk channel from the feeding bottle (A-51) to the nipple for blending and/or drinking of the milk, the milk channel being sealed and isolated from the external environment. Therefore, after milk powder and water are respectively allocated and filled in advance, the milk powder box does not need to be disassembled in subsequent use, and sealing effect can be maintained.Linvention concerne une boîte de poudre de lait (A-52), un dispositif de mélange de poudre de lait (A-50) utilisant la boîte de poudre de lait (A-52), et un procédé de mélange auxiliaire pour poudre de lait la partie supérieure de la boîte de poudre de lait (A-52) est reliée à une tétine et reliée à un bidon (A-51) par lintermédiaire dun second mécanisme de raccordement (A-5
