Abstract: A water saving type household reverse osmosis (RO) membrane assembly belongs to the technical field of household purified water and resolves the problem of wasting water resources. The assembly includes a shell, and at least two RO membrane components. The RO membrane components are used by a way of series connection in a proper order, nesting or a combination of series connection and nesting. In two adjacent RO membrane components, a waste water discharge outlet of one of the RO membrane components connects with a water inlet of another RO membrane component, and clean water discharge outlets for all RO membrane components are connected to a clean water pipe. The water-saving type household reverse osmosis membrane assembly provided is rational in design, simple in structure, convenient for production, and reduces cost with a high water recovery rate.