The invention provides an independent enclosure body and a manufacturing and installing method of the enclosure body and aims to achieve independent enclosure of a building in an industrialized mode. According to the technical scheme, a light-weight high-strength prefabricated wall part is provided. The prefabricated wall is used as a carrier, architectural ornament is loaded on the outer side, architectural heat insulation is loaded on the inner side, and doors and windows of the building are loaded at the same time. Modularization, productization, prefabrication and assemblage of the enclosure of the building are achieved in an integrated and independent mode of the enclosure, the ornament, energy conservation, the doors and the windows. Prefabricated walls are installed on the outer surface of the building so as to form the independent enclosure body, and the prefabricated walls, a building structure or additional inner walls form a composite wall body on the whole. The independent enclosure body encloses a building structure body on the outer side and so that an outer surface structure of the building is formed. The building structure body encloses in the independent enclosure body so as to form an inner independent structure body of the building. The independent enclosure body is suitable for outer enclosure projects of various buildings, particularly for various high-rise and multilayer civil and energy saving building projects which are newly built, and further suitable for maintaining and remolding projects of existing buildings.