The utility model provides a reverse osmosis system. Characterized in that it is characterized in that it comprises, the device comprises a pretreatment device, the pretreatment device is connected with a reverse osmosis water feeding pump; a reducing agent and a scale inhibitor are sequentially put into a pipeline between the pretreatment device and the reverse osmosis water feeding pump; whereinthe reverse osmosis water feeding pump is connected with the first precision filter, the first precision filter is connected with the reverse osmosis high-pressure pump, the reverse osmosis high-pressure pump is connected with the reverse osmosis device, the pretreatment device is further connected with the energy recovery water feeding pump, and the reducing agent and the scale inhibitor are sequentially put into a pipeline between the pretreatment device and the energy recovery water feeding pump; the utility model has the advantages that: the utility model has the advantages that: the structure is simple; a reducing agent and a scale inhibitor are added into a water inlet end pipeline of the water feeding pump; according to the reverse osmosis water treatment device, the agents are fully mixed and dispersed before entering the reverse osmosis module, the service life, the water yield and the water quality of a reverse osmosis membrane element are ensured, the agents are mixed and dispersed by virtue of the hydraulic mixing effect of the two water supply pumps and the buffer retention time of the precision filter, and the investment cost and the operation energy consumption arereduced.