Pre-assembly process of roll-type membrane element and membrane element

The invention relates to the technical field of water treatment, in particular to a roll-type membrane element pre-assembly process and a membrane element. The method comprises the following steps that concentrated water runner cloth is clamped between a first PE membrane and a second PE membrane, and pure water runner cloth is placed on the outer side surface of the first PE membrane or the outerside surface of the second PE membrane; and the pure water runner cloth, the first PE material membrane, the second PE material membrane and the concentrated water runner cloth are welded together. The membrane element is prepared by adopting the roll-type membrane element pre-assembly process. The PE membrane, the pure water runner cloth and the concentrated water runner cloth are welded and pre-assembled, wherein the step of placing the pure water runner cloth in the membrane element rolling process is omitted; therefore, on one hand, the rolling efficiency of the water treatment roll typemembrane element of the PE