Take the silicone insulation board produced by the factory as the building exterior wall insulation board, place it at the bottom of the formwork produced by the prefabricated component factory, bind the built-in reinforcement of the concrete exterior wall board on it and install the HUYU connector, pour the concrete at one time according to the reverse striking process, and the HUYU connector firmly connects the insulation board (including plastering layer and finishing layer) to the inner leaf wall, forming an external wall insulation system on the external surface which is composed of plastering layer and finishing layer and the integrated structure of precast concrete cladding wall.