The present application provides a metal curtain wall. The metal curtain wall comprises a rectangular metal plate, a metal frame disposed along an edge of the back of the metal plate, and corner codesfixed on the metal frame; the metal curtain wall further includes a cross bar and at least one elastic rope sleeve which are disposed in the metal frame; one end of the cross bar is hinged on an inner side of one frame side of the metal frame, and the other end of the cross bar is connected to the inner side of the opposite frame side through a fastener; a plurality of hooks are arranged on the inner side of the metal frame; a plurality of hanging nails are arranged on the cross bar; the elastic rope sleeves are wound between at least two hooks or between the hanging nails and the hooks; receiving cavities for receiving rock wool are formed between the elastic rope sleeves and the metal plate; the cross bar can play a structural strengthening role, and can play a fixed role of the rock wool; the hanging nails on the cross bar can be used to hook the elastic rope sleeves; the elastic rope sleeves are wound between the hooks or between the hooks and the hanging nails to further fix therock wool; and the winding density of the elastic rope sleeves is adjusted according to factors such as the type of rock wool, the size of the metal plate, and the fixing degree.