Abstract: A water jet condenser with multiple closed water chambers and a jet flow adjusting valve used in a sugar refinery. A water chamber of the condenser is divided into an open large water chamber (6) and a plurality of closed small water chambers (14); each water chamber is respectively provided with a jet nozzle (3) and a spray nozzle (7); the plurality of closed small water chambers (14) are respectively controlled by a plurality of pneumatic or electric butterfly valves (4); the lower part of the condenser body (13) is provided with a single-layer or multi-layer jet flow regulating valve (2) for keeping the concentric change of the diameter of the central round aperture of a jet flow passage; the jet nozzle (3) and the spray nozzle (7) in each water chamber are respectively cooperated with the single-layer or multi-layer jet flow regulating valve (2).