Reverse osmosis technology is a modern high-tech developed in China in recent years. Reverse osmosis is to apply a pressure greater than the osmotic pressure to the solution to make water pass through a special semi-permeable membrane and separate it from the solution. Because this process is the opposite of osmosis, it is called reverse osmosis. According to the different osmotic pressure of various materials, it is possible to use a reverse osmosis method greater than the osmotic pressure for a certain solution to achieve the purpose of separating, extracting, purifying and concentrating the solution. The reverse osmosis device mainly separates the ion range in the solution. It does not require heating and has no phase change process, so it consumes less energy than traditional methods.