Preparation method of superhigh maltose syrup

The invention relates to a preparation method of superhigh maltose syrup, comprising mixing starch into slurry, liquefying amylase at a high temperature, and the belta-amylase, Pullulanase and maltase are saccharified synergistically, midrange thermal stable amylase (alpha-amylase generated by bacillus subtilis, the optimal reaction temperature is 70 DEG, being called midrange thermal stable amylase), and the belta-amylase are all liquifying enzyme, technicians of the business can imagine a method without using the midrange thermal stable amylase to reach the same effect, and the other enzyme using mode is the same without creativity. And using exquisite technology such as ultrafiltration etc. to obtain the superhigh maltose syrup. The invention controls starch liquefacation DE value less than four, and uses technologies such as three enzymes cooperative saccharification, ultrafiltration decolorization and removing macromolecules to prepare superhigh maltose syrup in connection with defects such as high liquefaction DE value in early processing stage, low content of maltose after glycosylation processing of single enzyme and double enzymes, complicate process of subsequent refining.