The invention discloses a
microwave vacuum freeze-
drying method for rhizoma gastrodiae. The
microwave vacuum freeze-
drying method comprises the following steps: firstly, cleaning and draining fresh rhizoma gastrodiae; secondly, pre-freezing the rhizoma gastrodiae at the temperature of 10 DEG C below zero to 30 DEG C below zero for 1 hour to 1 year; thirdly,
slicing and pricking the rhizoma gastrodiae obtained in the second step; fourthly, putting the pricked rhizoma gastrodiae into a
microwave freezing dryer, and freezing at the pressure of 5 to 20 Pa and the temperature of 35 DEG C below zero to 40 DEG C below zero for 1 to 3 hours; introducing
nitrogen, controlling the pressure at 20 to 100 Pa, controlling
microwave power at 100 to 300 w / kg when the time reaches 0 to 3 hours, controlling the
microwave power at 300 to 500 w / kg when the time reaches 3 to 6 hours, controlling the
microwave power at 100 to 200 w / kg when the time reaches 6 to 8 hours, and warehousing to obtain freeze-dried rhizoma gastrodiae slices. The method disclosed by the invention has the advantages of short production period and low
energy consumption and cost for
freeze drying; in addition, effective ingredients, nutritional ingredients, appearance, color and luster of the fresh rhizoma gastrodiae are sufficiently protected from being damaged, original shapes of crude products are maintained, and the rhizoma gastrodiae slices are crisp and tasty in
mouthfeel.