The invention discloses a detachable insulating sleeve for steam pipelines and equipment. The detachable insulating sleeve comprises insulating clothes, and a plurality of groups of hasps are arranged on the two sides of the insulating clothes; a shrinkage opening is formed in a port on one side of a splicing part of the two pieces of insulating clothes; a waterproof convex rib or groove is arranged on the inner wall of the shrinkage opening; an expansion opening matched with the shrinkage opening is formed in a port on the other side of the splicing part; a corresponding waterproof groove or convex rib is arranged on the expansion opening; and the insulating clothes are provided with outer layers, inner layers and middle layers. The detachable insulating sleeve for the steam pipelines and equipment is composed of the insulating clothes and can be detached, the possibility of changing the insulating sleeve on a large scale is reduced, and the influence on the pipelines is reduced; a composite insulation quilt composed of an inorganic salt fiber layer, aluminum foil glass fiber cloth and an aluminum foil air sac reflecting layer is excellent in heat-insulating property; the soft insulating sleeve has good coating performance and good sealing performance; and the self sealing and waterproof performance of the parts is good, and the service life is long.