Pure water preparation system

The invention discloses a pure water preparation system. The system comprises a filter and a reverse osmosis device connected to the filter, a pure water storage tank (9) is connected to the reverse osmosis device, the filter comprises a quartz sand filter (1), a fine quartz sand filter (2) and a resin filter (3), the filters are connected in series, the quartz sand filter (1), the fine quartz sand filter (2) and the resin filter (3) are respectively connected to booster pumps (4), the reverse osmosis device comprises a primary reverse osmosis device (5) and a secondary reverse osmosis device (6) connected to the primary reverse osmosis device (5), a countercurrent membrane purifier (7) and a high-pressure pump (8) are connected between the resin filter (3) and the primary reverse osmosis device (5), and the pure water storage tank (9) is connected to the secondary reverse osmosis device (6). The pure water preparation system can provide sufficient water to the winery, has a simple structure and can work reli