A milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) and a device for reconstituting milk powder (A-50, B-10, C-50) using the same (A-52, B-12, C-52, D-2, E-2, H-42) and a method for reconstituting milk powder with assist thereof. An upper part of the milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) can be connected with a nipple, and connected to a milk bottle (A-51, B-11, C-51, D-1, E-1, H-41) by a second connecting mechanism (A-524, B-124, C-523, D-22, E-22, F-22, H-422) the milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) has a milk powder outlet (A-526, B-126, E-27, H-426) and a milk powder outlet valve (A-523, C-53, D-3, E-23, F-222, H-412) the milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) is operated by a operation part (C-54, E-24), enabling a relative movement between the milk powder outlet (A-526, B-126, E-27, H-426) and the milk powder outlet valve (A-523, C-53, D-3, E-23, F-222, H-412) so as to open or close the milk powder outlet (A-526, B-126, E-27, H-426) when the milk powder outlet (A-526, B-126, E-27, H-426) is blocked by the milk powder outlet valve (A-523, C-53, D-3, E-23, F-222, H-412) by the relative movement, the inner chamber of the milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) forms a milk powder-containing chamber sealed and isolated from the inner chamber of the milk bottle (A-51, B-11, C-51, D-1, E-1, H-41) for containing the milk powder when the movement makes the milk powder outlet (A-526, B-126, E-27, H-426) open, at least one position can enable a milk powder channel to be sealed and isolated from the environment between the milk powder container (A-52, B-12, C-52, D-2, E-2, H-42) and the milk bottle (A-51, B-11, C-51, D-1, E-1, H-41) through the milk powder outlet (A-526, B-126, E-27, H-426), and enable a milk channel to form from the milk bottle (A-51, B-11, C-51, D-1, E-1, H-41) to the nipple, the milk channel being sealed and isolated from the environment and used for reconstituting milk
