Method for preparing powder wall mastic with desullfurization gypsum

The invention relates to a method of preparing desulfurization gypsum dry powder painting putty by using desulfurization gypsum as raw material, which belongs to chemical construction material and solid castoff comprehensive utilization field. The components and weight percent thereof are: desulfurization gypsum of 65-80%, calcium increasing agent of 5-15%, powdery filler of 10-20%, composite exciting agent of 0.5-3%, bonding of 0.5-2%, retarder of 0.1-0.2%, water keeping agent of 0.2-0.5%, and polypropylene fiber of 0.05-0.15%. The prepared desulfurization gypsum dry powder painting putty uses desulfurization gypsum to replace natural gypsum; can reduce cost of putty, fully utilize resource, reduce area of stacked desulfurization gypsum d, and save land resources; and possesses advantages of not craze, not easy to abscission, base resistance, water resistance, innocuity, and smellless.