Method for preparing biological degradable macromolecule agricultural nano film with nitrogen, phosphorus and potassium

The invention relates to the field of agricultural films and in particular discloses a method for preparing a biological degradable macromolecule agricultural nano film with nitrogen, phosphorus and potassium. The method specifically comprises the following steps: enabling formaldehyde and urea to react at a certain temperature so as to obtain a hydroxymethyl urea solution; adding calculated amounts of PVA (polyvinyl Alcohol), glycerinum and water into another reactor; sequentially adding a calculated amount of monopotassium phosphate and the prepared hydroxymethyl urea solution, performing uniform mixing, and performing a reaction at a certain temperature so as to obtain a clear solution; and forming a film from the obtained clear solution, and performing drying, so as to obtain the biological degradable macromolecule agricultural nano film with nutrient elements nitrogen, phosphorus and potassium. The biological degradable macromolecule agricultural nano film with the nutrient elements nitrogen, phosphorus