Preparation method of fruit and vegetable enzyme crystalline powder

The invention relates to a production technology of enzymes, in particular to a preparation method of fruit and vegetable enzymes. The preparation method of the fruit and vegetable enzymes includes the following steps of: (1), soluble-substance extraction, wherein pulping, enzymolysis, enzyme deactivation, sterilization and filtration are conducted, and a soluble extract solution is extracted; (2), fermentation, wherein bacteria are used for inoculation, fermentation is conducted at 37-42 DEG C for 3-7 days, a fermentation broth is subjected to sterilization, filtration, centrifugation and micron filtration, and then a fruit and vegetable fermentation liquid is obtained; (3), spray drying, wherein the fruit and vegetable fermentation liquid is subjected to vacuum concentration untill the content of soluble solids reaches 30% or above, standing is conducted, spray drying is carried out, and a fruit and vegetable enzyme powder is obtained; and (4), vacuum drying, wherein the fruit and vegetable enzyme powder is