Low-lactose milk powder and preparation method thereof

The title of the invention is low-lactose milk powder and a preparation method thereof. The invention discloses low-lactose milk powder, which contains (by weight): 22-25% of fat, 20-23% of protein and 5.5% and below of lactose. The invention discloses a preparation method of the low-lactose milk powder, comprising the following steps: (1) acceptance inspection of raw milk; (2) separation for milk purification; (3) pre-sterilization; (4) primary burdening; (5) secondary burdening; (6) homogenizing and pre-sterilization; (7) lactase enzymolysis; (8) enzyme deactivation treatment; (9) milk heating-up and preheat sterilization; (10) evaporation and concentration; (11) high pressure atomizing; (12) drying and fluidized bed redrying; (13) powder discharge and powder screening; and (14) packaging. By controlling physical and chemical indexes of a material before hydrolysis and by the utilization of a high-temperature lactose enzyme hydrolysis technology, the low-lactose milk powder is produced, and lactose hydrolys