The invention discloses a dismounting method for a laminating assembly. The laminating assembly comprises a plurality of battery pieces which are sequentially stacked and conductive glue layers, wherein the conductive glue layer is arranged between adjacent two battery pieces. A dismounting method for the laminating assembly comprises the following steps of: pulling a cutting line to be a straightline, wherein tensile strength of the cutting line is greater than or equal to 1000 MPa; fixing the laminating assembly, and enabling the cutting line to align to the conductive glue layers; and pulling the cutting line in an extending direction of a surface, which is in contact with the conductive glue layers and is parallel to the battery pieces, of the cutting line, and enabling every two adjacent battery pieces to separate. The dismounting method for the laminating assembly adopts the cutting line with tensile strength greater than 1000 MPa to cut the conductive glue layer between every two adjacent battery pieces, so that no-loss separation of the battery pieces is realized, and dismounting and repair of the battery pieces are simplified.