▎ 摘　　要

NOVELTY - Polymer-framework interface nanometer reinforcing agent comprises 100 pts. wt. polar polymer, 0.05-50 pts. wt. nano filler, 0.01-10 pts. wt. polyphenols compound and 0.01-10 pts. wt. multivalent metal salt. USE - Polymer-framework interface nanometer reinforcing agent. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a polymer-framework interface nanometre reinforcing agent, which involves dispersing nano-filler under the assistance of polyphenolic compound, dispersing the nano-filler in solvent A under a certain condition to obtain dispersion A, dispersing the polar polymer in the solvent B under a certain condition to obtain the dispersion liquid B, where the solvent A and the solvent B are the same or can be dissolved in each other, mixing the dispersion liquid A and B under a certain condition, then adding multivalent metal salt to obtain product.