High performance environmental protection processed adhesive powder and its preparing method

The adhesive powder for building is prepared with starch, modifier, alcohol, alkali solution, catalyst and tackifier. The preparation process includes adding mixed liquid of modifier and industrial alcohol into starch via stirring to obtain modified starch; adding alkali solution and tackifier into the modified starch via stirring and letting stand; drying the reaction product, crushing, sieving to obtain product. The adhesive powder exhibits high adhesion, excellent environment protecting performance and mildew-proof and antiseptic performance, and may be used widely in building inner wall putty, building paint, corrugated paper box adhesive, etc.