Concrete protection and repair polymer composite membrane with self-repair function and application

The invention discloses a concrete protection and repair polymer composite membrane with a self-repair function and application. The composite membrane is formed by compositing a water-swelling high-water-absorption fiber non-woven cloth repair layer with a polymer sheet protection layer. The polymer sheet protection layer is composited with the water-swelling high-water-absorption fiber non-woven cloth repair layer through a spraying film process or a hot pressing process or in an adhesive bonding mode. According to the application method of the composite membrane, by pre-burying the composite membrane in the surface of a concrete structure of a building, gaps and cracks in the surface of the concrete structure can be repaired, water vapor, chemical substances, carbon dioxide and the like can be prevented from further intruding into the cracks, and protection layer damage caused by improper construction can be self-repaired; meanwhile, a waterproof and impervious protection film is formed on the surface of t