Building external wall heat insulation structure

The invention relates to the technical field of building external walls, and especially relates to a building external wall heat insulation structure. The structure comprises an expanded perlite and athermal insulation porcelain coating layer. The inner side of the expanded perlite is slidably connected with a position clamping piece. The inner side of the position clamping piece is slidably connected with a silicon dioxide aerogel thermal insulation felt which is arranged horizontally. The bottom end of the silicon dioxide aerogel thermal insulation felt is provided with an ESP plate. The bottom end of the ESP plate is provided with an asbestos board. The bottom end of the asbestos board is provided with a PET plate. Through the expanded perlite, the thermal insulation porcelain coatinglayer, the silicon dioxide aerogel thermal insulation felt, the ESP plate, the asbestos board, and the PET plate, thermal insulation effect of a building external wall can be effectively improved. Anexternal wall body formed b