Self-repairing paint and preparation method thereof

The invention relates to self-repairing paint and a preparation method thereof, and belongs to the technical field of metal protection. The preparation method comprises the following steps: adding self-made mesoporous silicon dioxide nanoparticles into a benzotriazole ethanol solution, and stirring to obtain mesoporous silicon dioxide nanoparticles loading a corrosion inhibitor; adding the mesoporous silicon dioxide nanoparticles loading the corrosion inhibitor into a zirconium n-propoxide alcohol solution and stirring; adding a nitric acid solution and stirring; filtering to obtain filter residues; adding the filter residues into a chitosan solution; after carrying out ultrasonic dispersion, centrifugally separating to obtain sediment; adding the sediment into a sodium alginate solution; after carrying out the ultrasonic dispersion, centrifugally separating to obtain a layer-by-layer packaged corrosion inhibitor; finally, uniformly stirring epoxy resin, a diluting agent, a curing agent, the layer-by-layer pa