The invention provides a preparation method of corn stigma 
polysaccharide and application of the corn stigma 
polysaccharide in a 
hypoglycemic product, and relates to the technical field of extraction.The preparation method specifically comprises the steps that 1, pretreatment is conducted, specifically, corn stigma is cleaned, dried, smashed and then sieved, corn stigma 
powder is obtained, the corn stigma 
powder is soaked with ethyl 
alcohol, impurities are removed, and after the operation is repeated for three times, degreased corn stigma 
powder is obtained; (2) extraction: adding water and compound 
protease into the degreased corn stigma powder, soaking, carrying out primary heating extraction, cooling, then adding bromelain and the solution A, soaking, carrying out secondary heating extraction to obtain a leaching solution, and removing precipitates after 
enzyme deactivation and 
centrifugation to obtain a corn stigma 
polysaccharide clear solution; (3) 
impurity removal: dialyzing the corn stigma polysaccharide 
clear liquid to obtain dialyzed internal liquid; and (4) post-treatment: washing and 
drying the 
dialysis internal liquid to obtain the corn stigma polysaccharide. High-yield and high-purity corn stigma polysaccharide extraction can be realized, and the corn stigma polysaccharide can be applied to hypoglycemic products.