The invention discloses milk powder capable of improving sleep, which is prepared from the following raw materials of 0.1g-10g of r-reanal, 0.1g-12g of wood jujube extract, 0.1-12g of spina date seed extract, 100mu g-10mg of vitamin B2 and 99.6999g-65.99g of milk powder. The milk powder can reduce neuron activity, inhibit the dysphoria information to be transferred into brain center, calm the nerves and resist dysphoria, has the functions of stabilizing spirit and calming, can remarkably improve the sleep condition, and is especially suitable for people with poor sleep conditions for eating.