Reverse osmosis membrane assembly and water purification device

The present invention provides a reverse osmosis membrane assembly and a water purification device, the reverse osmosis membrane assembly comprises: a central pipe, which is a hollow pipe having two open ends and separated by a partition plate in the middle, so as to form a raw water inlet cavity and a concentrated water outlet cavity which are arranged up and down; the reverse osmosis membranes are folded and wound on the central pipe, a raw water flow channel is formed between the front surfaces of the adjacent reverse osmosis membranes after folding, and a pure water flow channel is formed between the back surfaces of the adjacent reverse osmosis membranes after folding; a division bar is arranged at the position, corresponding to the partition plate, in the raw water flow channel, and a gap is formed between the tail end of the division bar and the side edge, away from the central pipe, of the reverse osmosis membrane, so that the raw water flow channel is divided into a first flow channel and a second fl