Manufacturing method of spiral-wound reverse osmosis membrane element, spiral-wound reverse osmosis membrane element and water purifier

The invention provides a roll-type reverse osmosis membrane element manufacturing method, a roll-type reverse osmosis membrane element and a water purifier, and belongs to the technical field of water purifier design, and the manufacturing method comprises the following steps: folding the front side of a first reverse osmosis membrane into a first membrane and a second membrane which take a folded edge as a boundary; the front surface of the second reverse osmosis membrane is folded to form a third membrane and a fourth membrane which take a folded edge as a boundary, the rolling length of the first membrane is greater than that of the second membrane, and the rolling length of the fourth membrane is greater than that of the third membrane; placing the folded second reverse osmosis membrane on the folded first reverse osmosis membrane, enabling the reverse side of the second membrane to be opposite to the reverse side of the third membrane, and applying glue between the reverse side of the second membrane and