RO (reverse osmosis) sewage treatment system

The utility model discloses a reverse osmosis (RO) sewage treatment system which comprises a sewage storage tank, reverse osmosis equipment and an effluent storage tank, and further comprises a quartz sand filtering tank and an activated carbon filtering tank, the sewage storage tank, the quartz sand filtering tank and the activated carbon filtering tank are sequentially connected through pipelines, and the activated carbon filtering tank is connected with a first filter through a pipeline. The output end of the first filter is connected to reverse osmosis equipment, the output end of the reverse osmosis equipment is connected to an effluent storage tank, a wastewater port of the reverse osmosis equipment is connected with a concentrated water pipe, the other end of the concentrated water pipe is connected to an electrochemical descaling tank, and sewage ports of the quartz sand filtering tank and the activated carbon filtering tank are respectively connected to the concentrated water pipe; a cleaning assembl