▎ 摘　　要

NOVELTY - Preparing stacked graphene hydrogel photonic crystal thin film involves: (S1) taking monodisperse nanoparticles of different diameters to prepare opal-type photonic crystal thin films with different pore sizes; (S2) evenly permeating a graphene polyurethane solution into the pores of the opal-type photonic crystal thin film with different pore sizes, polymerizing, and removing the opal-type photonic crystal structure in the opal-type photonic crystal thin film to obtain ordered graphene inverse opal-type photonic crystal thin films with different structural colors; (S3) stacking the graphene inverse opal-type photonic crystal thin films of different structural colors at 60 degrees C, applying a pressure of 10 kg and then drying under atmospheric pressure to form an overall structure; and (S4) using a soaking liquid to completely soak the overall structure. USE - The method is useful for preparing stacked graphene hydrogel photonic crystal thin film.