External wall thermal insulation structure and preparation method and construction method thereof

The invention discloses an external wall thermal insulation structure and a preparation method and a construction method thereof, and relates to the technical field of building construction.The external wall thermal insulation structure comprises a thermal insulation board and further comprises a protective layer arranged on one side of the thermal insulation board, and the protective layer is used for improving the strength of the thermal insulation board and serves as a formwork when concrete is poured; the fixing pieces comprise fixing pieces and rod bodies, the fixing pieces are arranged at one ends of the rod bodies and perpendicularly and fixedly connected with the rod bodies, the fixing pieces are arranged on the sides, away from the protection layer, of the heat preservation plates, the rod bodies penetrate through the protection layer and the heat preservation plates, the other ends of the rod bodies extend out of the protection layer, and the fixing pieces prevent the rod bodies from slipping when c