A reverse osmosis filtration system (100, 100A, 100B, 100C), comprising: a raw water pipeline (L1); a reverse osmosis filtration unit (10, 10A, 10B, 10C) configured to filter raw water supplied by the raw water pipeline (L1); and a faucet (30, 30A, 30B, 30C) connected to the reverse osmosis filtration unit (10, 10A, 10B, 10C), wherein the faucet (30, 30A, 30B, 30C) is operable such that a water outlet (33) of the faucet (30, 30A, 30B, 30C) is selectively in communication with a product water outflow pipeline of the reverse osmosis filtration unit (10, 10A, 10B, 10C). The reverse osmosis filtration system (100, 100A, 100B, 100C) further comprises a pump unit (50, 50A, 50B, 50C) arranged between the raw water pipeline (L1) and the reverse osmosis filtration unit (10, 10A, 10B, 10C), wherein the pump unit (50, 50A, 50B, 50C) is configured to selectively pump the raw water in the raw water pipeline (L1) to the reverse osmosis filtration unit (10, 10A, 10B, 10C) according to a pressure in the product water outflow pipeline. The reverse osmosis filtration system (100, 100A, 100B, 100C) can operate stably even when a pressure in the raw water pipeline (L1) is low, can provide the operation stability of the reverse osmosis filtration system (100, 100A, 100B, 100C), and can realize on-demand water supply for the reverse osmosis filtration unit (10, 10A, 10B, 10C).