The invention discloses a milk powder quantitative subpackage device which comprises a base, a support arranged on the base and a milk powder container arranged on the support. An opening is formed in the upper end of the milk powder container and provided with a sealing cover, and an opening is formed in the lower end of the milk powder container and connected with a quantitative device. The quantitative device comprises a quantitative assembly with a feeding opening and a discharging opening and an unsealing assembly capable of opening or closing the feeding opening and the discharging opening of the quantitative assembly. The milk powder quantitative subpackage device has the beneficial effects that quantitative milk powder can be taken out at a time or many times, milk powder can be conveniently brewed or directly subpackaged in a milk powder box quantitatively, and use is convenient.