The utility model discloses a reflux condensation vacuum device, comprising a barrel body, a water injection cylinder and a spraying cylinder. The utility model is characterized in that the spraying cylinder and the water injection cylinder are two independent components; the spraying cylinder is arranged above the water injection cylinder; a plurality of layers of radial manifolds are arranged along an axis line of the spraying cylinder; the top of the manifold is provided with a spraying nozzle; the lower part of the water injection cylinder is provided with a plurality of water injection nozzles; the central lines of all water injection nozzles are focused outside a certain distance; the water injection cylinder and the spraying cylinder are respectively provided with a water inlet cylinder connected with a water filter cylinder outside the barrel body. When in working, the sprayed water mist has a reflux condensation function with the liquor reversely flowing into a mist chamber; the hot liquor is sharply contracted by the condensation, thus reaching the condensation and vacuum pumping aims. The working process of the structure is divided into two pumping processes. Owning to the reflux condensation of the condensation process, the utility model has the advantages of better condensation effect, faster vacuum pumping speed, higher vacuum degree, less water dosage and being suitable for the condensation and vacuum pumping of sugar bowls in sugar factories, vaporization tanks and all steam vaporization processes.