Vacuum freeze dryer is a kind of equipment used to remove the moisture of the material. The moisture is directly sublimated from the solid state to the gaseous state through freezing and vacuum environment, retaining the original structure and active ingredients of the material. Widely used in food, medicine, biological products and other fields, such as freeze-dried fruits and vegetables, vaccines, strains, etc. Attention should be paid when using: ensure that the material is fully pre-frozen to avoid excessive ice crystals; control the vacuum degree and temperature to prevent the material from overheating or uneven drying; clean the equipment regularly to avoid pollution. The equipment is efficient and energy-saving, can extend the shelf life of the product, and maintain nutrients and flavor.