NOVELTY - Method for reclaiming maize glycoprotein dreg and preparing protein nitrogen source and nitrogen containing syrup, involves adding maize starch to pulping tank, spraying and liquefying pulp continuously, adding glucoamylase to the obtained solution, and hydrolyzing the solution, opening discharge valves at upper portion of the tank, separating saccharifying solution from glycoprotein dreg and, dehydrating the obtained solution, drying the dehydrated solution, crushing the dried mixture, and sieving the crushed mixture, packaging the sieved mixture to obtain protein product.    USE - The method is useful for reclaiming maize glycoprotein dreg and preparing protein nitrogen source and nitrogen containing syrup.    ADVANTAGE - The method increases the production performance of filtering equipment and reduces times of assembling and disassembling filtering machines, washing sewage and various losses.    DETAILED DESCRIPTION - Method for reclaiming maize glycoprotein dreg and preparing protein nitrogen source and nitrogen containing syrup, involves (a) adding water to a pulping tank, stirring the tank continuously, adding maize to the tank, controlling the concentration of solid in pulp, maintaining the pH at 5.6-6.4, adding alpha -diastase (0.2-1.2 kg), stirring the mixture uniformly, (b) spraying and liquefying the pulp continuously, maintaining the temperature at 95-100 degrees C for 60-140 minutes, (c) cooling the liquefied solution at 50-65 degrees C, adding glucoamylase (0.06-1.50 kg), hydrolyzing the obtained solution for 20-70 hours, (d) allowing the solution to stand for more than 4 hours, (e) opening discharge valves at upper portion of the tank such that saccharifying solution rich in flocculated glycoprotein dreg at the upper portion of the tank is pumped out, maintaining the pH for 4.8-5.2, (f) separating saccharifying solution from glycoprotein dreg by performing centrifugation, mixing the separated saccharifying solution, refining the mixed solution, and condensing the mixture to obtain starch syrup, and (g) dehydrating the obtained solution, drying the dehydrated solution, crushing the dried mixture, and sieving the crushed mixture, packaging the sieved mixture to obtain protein product, or dehydrating the glycoprotein dreg obtained in step (f) through dry method or enzymatic method, neutralizing the dehydrated mixture, refining the dehydrated mixture, and condensing the purified mixture to obtain protein nitrogen source, mixing the protein nitrogen source with syrup to obtain nitrogen-containing starch syrup for fermentation.