Building energy-saving transformation outer wall heat preservation device

The utility model relates to the technical field of building external wall thermal insulation, and discloses a building energy-saving transformation external wall thermal insulation device which comprises external wall bodies, dismounting assemblies, connecting assemblies, a waterproof plate and a thermal insulation assembly, and the front end of each external wall body is fixedly provided with the dismounting assembly. According to the building energy-saving transformation outer wall heat preservation device, a first pressing plate and a second pressing plate are adjusted so that a fixing block can stretch out and draw back conveniently, the connected heat preservation device can be disassembled, disassembling is more convenient, the heat preservation device can be repeatedly used after being disassembled, a threaded groove can assist a threaded rod in reinforcing connection, installation is firmer, and the practicability is high. The fixing blocks can stretch out and draw back through the reset springs, the