a soft pack supercapacitor comprising: an aluminum plastic film, an electrode diaphragm composite layer wrapped by said aluminum plastic film, and an electrolyte; wherein said electrode diaphragm composite layer comprises a layer of diaphragm, a layer of electrode sheet, a second layer of diaphragm, a second layer of electrode sheet, and a third layer of diaphragm in sequence, and said electrode diaphragm composite layer is provided in a continuous Z-fold structure; and the soft pack supercapacitor further includes two pole lugs, which are connected to said one-layer electrode sheet and said two-layer electrode sheet, respectively. Widely used in power storage, UPS energy storage, energy saving and consumption reduction