Side-flow type reverse osmosis filter element and water purifier

The invention discloses a side-flow type reverse osmosis filter element. According to the invention, a fresh water center pipe is located at the center; purified water enters from a purified water inlet and then flows towards the end of the fresh water center pipe in the length direction of the fresh water center pipe; a filtering layer comprises a reverse osmosis membrane, a fresh water flow guide net and a concentrated water flow guide net which are stacked layer by layer; a fresh water cavity is defined by the reverse osmosis membrane and the fresh water flow guide net, and waterproof adhesive tapes are arranged on the upper edge, the lower edge and the outer side edge of the fresh water cavity; a concentrated water cavity is defined by the reverse osmosis membrane and the concentratedwater flow guide net, and waterproof adhesive tapes are arranged on the upper edge and the lower edge of the concentrated water cavity; and concentrated water outlets are formed in the waterproof adhesive tapes arranged on th